change http get header example to use a record (#15674)

# Description

When first using `http get`, I was confused that all the examples used a
list for headers, leading me to believe this was the only way, and it
seemed a little weird having records in the language. Then, I found out
that you can indeed use record, so I changed the example to show this
behavior in a way users can find. There still is another examples that
uses a list so there should be no problem there.

# User-Facing Changes
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crates/nu-command/src/network/http/delete.rs

@@ -117,8 +117,13 @@ impl Command for HttpDelete {
                 result: None,
             },
             Example {
-                description: "http delete from example.com, with custom header",
-                example: "http delete --headers [my-header-key my-header-value] https://www.example.com",
+                description: "http delete from example.com, with custom header using a record",
+                example: "http delete --headers {my-header-key: my-header-value} https://www.example.com",
+                result: None,
+            },
+            Example {
+                description: "http delete from example.com, with custom header using a list",
+                example: "http delete --headers [my-header-key-A my-header-value-A my-header-key-B my-header-value-B] https://www.example.com",
                 result: None,
             },
             Example {

crates/nu-command/src/network/http/get.rs

@@ -115,12 +115,12 @@ impl Command for HttpGet {
                 result: None,
             },
             Example {
-                description: "Get content from example.com, with custom header",
-                example: "http get --headers [my-header-key my-header-value] https://www.example.com",
+                description: "Get content from example.com, with custom header using a record",
+                example: "http get --headers {my-header-key: my-header-value} https://www.example.com",
                 result: None,
             },
             Example {
-                description: "Get content from example.com, with custom headers",
+                description: "Get content from example.com, with custom headers using a list",
                 example: "http get --headers [my-header-key-A my-header-value-A my-header-key-B my-header-value-B] https://www.example.com",
                 result: None,
             },

crates/nu-command/src/network/http/head.rs

@@ -97,9 +97,15 @@ impl Command for HttpHead {
                 result: None,
             },
             Example {
-                description: "Get headers from example.com, with custom header",
+                description: "Get headers from example.com, with custom header using a record",
                 example:
-                    "http head --headers [my-header-key my-header-value] https://www.example.com",
+                    "http head --headers {my-header-key: my-header-value} https://www.example.com",
+                result: None,
+            },
+            Example {
+                description: "Get headers from example.com, with custom header using a list",
+                example:
+                    "http head --headers [my-header-key-A my-header-value-A my-header-key-B my-header-value-B] https://www.example.com",
                 result: None,
             },
         ]

crates/nu-command/src/network/http/options.rs

@@ -96,12 +96,12 @@ impl Command for HttpOptions {
                 result: None,
             },
             Example {
-                description: "Get options from example.com, with custom header",
-                example: "http options --headers [my-header-key my-header-value] https://www.example.com",
+                description: "Get options from example.com, with custom header using a record",
+                example: "http options --headers {my-header-key: my-header-value} https://www.example.com",
                 result: None,
             },
             Example {
-                description: "Get options from example.com, with custom headers",
+                description: "Get options from example.com, with custom headers using a list",
                 example: "http options --headers [my-header-key-A my-header-value-A my-header-key-B my-header-value-B] https://www.example.com",
                 result: None,
             },

crates/nu-command/src/network/http/patch.rs

@@ -114,9 +114,15 @@ impl Command for HttpPatch {
                 result: None,
             },
             Example {
-                description: "Patch content to example.com, with custom header",
+                description: "Patch content to example.com, with custom header using a record",
                 example:
-                    "http patch --headers [my-header-key my-header-value] https://www.example.com",
+                    "http patch --headers {my-header-key: my-header-value} https://www.example.com",
+                result: None,
+            },
+            Example {
+                description: "Patch content to example.com, with custom header using a list",
+                example:
+                    "http patch --headers [my-header-key-A my-header-value-A my-header-key-B my-header-value-B] https://www.example.com",
                 result: None,
             },
             Example {

crates/nu-command/src/network/http/post.rs

@@ -113,8 +113,13 @@ impl Command for HttpPost {
                 result: None,
             },
             Example {
-                description: "Post content to example.com, with custom header",
-                example: "http post --headers [my-header-key my-header-value] https://www.example.com",
+                description: "Post content to example.com, with custom header using a record",
+                example: "http post --headers {my-header-key: my-header-value} https://www.example.com",
+                result: None,
+            },
+            Example {
+                description: "Post content to example.com, with custom header using a list",
+                example: "http post --headers [my-header-key-A my-header-value-A my-header-key-B my-header-value-B] https://www.example.com",
                 result: None,
             },
             Example {

crates/nu-command/src/network/http/put.rs

@@ -113,8 +113,13 @@ impl Command for HttpPut {
                 result: None,
             },
             Example {
-                description: "Put content to example.com, with custom header",
-                example: "http put --headers [my-header-key my-header-value] https://www.example.com",
+                description: "Put content to example.com, with custom header using a record",
+                example: "http put --headers {my-header-key: my-header-value} https://www.example.com",
+                result: None,
+            },
+            Example {
+                description: "Put content to example.com, with custom header using a list",
+                example: "http put --headers [my-header-key-A my-header-value-A my-header-key-B my-header-value-B] https://www.example.com",
                 result: None,
             },
             Example {