update config documentation (#2178)

* update config documentation

* update config syntax

* update config syntax

* Update alias.md

Co-authored-by: Jonathan Turner <jonathandturner@users.noreply.github.com>

crates/nu-cli/src/commands/config/remove.rs

@@ -41,7 +41,7 @@ impl WholeStreamCommand for SubCommand {
     fn examples(&self) -> Vec<Example> {
         vec![Example {
             description: "Remove the startup commands",
-            example: "config --remove startup",
+            example: "config remove startup",
             result: None,
         }]
     }

crates/nu-cli/src/commands/config/set_into.rs

@@ -60,7 +60,7 @@ pub async fn set_into(
     // existing config
     let mut result = crate::data::config::read(name_span, &None)?;
 
-    // In the original code, this is set to `Some` if the `--load flag is set`
+    // In the original code, this is set to `Some` if the `load flag is set`
     let configuration = None;
 
     let rows: Vec<Value> = input.collect().await;