Add useful example to http options documentation (#9576)

This PR adds a more real-world example of how the new http options is
used, as well as some additional information in the description.

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

@@ -72,7 +72,7 @@ impl Command for SubCommand {
     }
 
     fn extra_usage(&self) -> &str {
-        "Performs HTTP OPTIONS operation."
+        "Performs an HTTP OPTIONS request. Most commonly used for making CORS preflight requests."
     }
 
     fn search_terms(&self) -> Vec<&str> {
@@ -111,6 +111,11 @@ impl Command for SubCommand {
                 example: "http options -H [my-header-key-A my-header-value-A my-header-key-B my-header-value-B] https://www.example.com",
                 result: None,
             },
+            Example {
+                description: "Simulate a browser cross-origin preflight request from www.example.com to media.example.com",
+                example: "http options https://media.example.com/api/ -H [Origin https://www.example.com Access-Control-Request-Headers \"Content-Type, X-Custom-Header\" Access-Control-Request-Method GET]",
+                result: None,
+            },
         ]
     }
 }