Changed category for panic and added search terms and examples (#13707)

# Description
Cosmetic changes around `panic` command. Changed category, added search
terms, and examples.

# User-Facing Changes
See above

crates/nu-command/src/misc/panic.rs

@@ -9,16 +9,22 @@ impl Command for Panic {
     }
 
     fn description(&self) -> &str {
-        "Executes a rust panic, useful only for testing."
+        "Causes nushell to panic."
+    }
+
+    fn search_terms(&self) -> Vec<&str> {
+        vec!["crash", "throw"]
     }
 
     fn signature(&self) -> nu_protocol::Signature {
         Signature::build("panic")
-            .input_output_types(vec![(Type::Nothing, Type::table())])
-            // LsGlobPattern is similar to string, it won't auto-expand
-            // and we use it to track if the user input is quoted.
-            .optional("msg", SyntaxShape::String, "The glob pattern to use.")
-            .category(Category::Experimental)
+            .input_output_types(vec![(Type::Nothing, Type::Nothing)])
+            .optional(
+                "msg",
+                SyntaxShape::String,
+                "The custom message for the panic.",
+            )
+            .category(Category::Debug)
     }
 
     fn run(
@@ -35,6 +41,10 @@ impl Command for Panic {
     }
 
     fn examples(&self) -> Vec<Example> {
-        vec![]
+        vec![Example {
+            description: "Panic with a custom message",
+            example: "panic 'This is a custom panic message'",
+            result: None,
+        }]
     }
 }