Add Go debugging example to debugger documentation (#31798)

This pull request updates the documentation for the debugger to include
Go-specific examples alongside existing Python examples.

Documentation update:

*
[`docs/src/debugger.md`](diffhunk://#diff-aa14715cca56f3ad6a32c669b0c317250dab212b8108136b7ca79217465f39b8R69-R80):
Added a new "Go examples" section with a JSON snippet demonstrating how
to configure the debugger for Go using Delve.

Release Notes:

- debugger: Add Go debugging example to debugger documentation

---------

Co-authored-by: Cole Miller <cole@zed.dev>

docs/src/debugger.md

@@ -109,6 +109,20 @@ Automatic scenario creation is currently supported for Rust, Go and Python. Java
 
 ### Example Configurations
 
+#### Go
+
+```json
+[
+  {
+    "label": "Go (Delve)",
+    "adapter": "Delve",
+    "program": "$ZED_FILE",
+    "request": "launch",
+    "mode": "debug"
+  }
+]
+```
+
 #### JavaScript
 
 ##### Debug Active File