Fix GitHub source code links for decorated functions (#13281) (#13290)

(cherry picked from commit 42ff77b)

Co-authored-by: Eric Arellano <[email protected]>

docs/conf.py

@@ -173,6 +173,10 @@ def linkcode_resolve(domain, info):
         except AttributeError:
             return None
 
+    # Unwrap decorators. This requires they used `functools.wrap()`.
+    while hasattr(obj, "__wrapped__"):
+        obj = getattr(obj, "__wrapped__")
+
     try:
         full_file_name = inspect.getsourcefile(obj)
     except TypeError: