Added examples to query web plugin (#8171)

# Description

_(Thank you for improving Nushell. Please, check our [contributing
guide](../CONTRIBUTING.md) and talk to the core team before making major
changes.)_

_(Description of your pull request goes here. **Provide examples and/or
screenshots** if your changes affect the user experience.)_

# User-Facing Changes

_(List of all changes that impact the user experience here. This helps
us keep track of breaking changes.)_

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

---------

Co-authored-by: Yethal <nosuchemail@email.com>

crates/nu_plugin_query/src/nu/mod.rs

@@ -1,6 +1,6 @@
 use crate::Query;
 use nu_plugin::{EvaluatedCall, LabeledError, Plugin};
-use nu_protocol::{Category, PluginSignature, Spanned, SyntaxShape, Value};
+use nu_protocol::{Category, PluginExample, PluginSignature, Spanned, SyntaxShape, Value};
 
 impl Plugin for Query {
     fn signature(&self) -> Vec<PluginSignature> {
@@ -23,6 +23,7 @@ impl Plugin for Query {
             .usage("execute selector query on html/web")
             .named("query", SyntaxShape::String, "selector query", Some('q'))
             .switch("as-html", "return the query output as html", Some('m'))
+            .plugin_examples(web_examples())
             .named(
                 "attribute",
                 SyntaxShape::String,
@@ -68,3 +69,26 @@ impl Plugin for Query {
         }
     }
 }
+
+pub fn web_examples() -> Vec<PluginExample> {
+    vec![PluginExample {
+        example: "http get https://phoronix.com | query web -q 'header'".into(),
+        description: "Retrieve all <header> elements from phoronix.com website".into(),
+        result: None,
+    }, PluginExample {
+        example: "http get https://en.wikipedia.org/wiki/List_of_cities_in_India_by_population
+    | query web -t [Rank City 'Population(2011)[3]' 'Population(2001)' 'State or union territory']".into(),
+        description: "Retrieve a html table from Wikipedia and parse it into a nushell table using table headers as guides".into(),
+        result: None
+    },
+    PluginExample {
+        example: "http get https://www.nushell.sh | query web -q 'h2, h2 + p' | group 2 | each {rotate --ccw tagline description} | flatten".into(),
+        description: "Pass multiple css selectors to extract several elements within single query, group the query results together and rotate them to create a table".into(),
+        result: None,
+    },
+    PluginExample {
+        example: "http get https://example.org | query web --query a --attribute href".into(),
+        description: "Retrieve a specific html attribute instead of the default text".into(),
+        result: None,
+    }]
+}