We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Deprecate falcon.api_helpers
See https://github.com/falconry/falcon/issues/1902.

Starting with 3.1, mark `falcon.api_helpers` as deprecated. We could employ module-level `__getattr__` or redecorate re-imported functions.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `falcon/api_helpers.py`
Content:
```
1 from .app_helpers import *  # NOQA
2 
3 # TODO deprecate
4 # import warnings
5 # from .util.deprecation import DeprecatedWarning
6 
7 # warnings.warn('The api_helpers module was renamed to app_helpers.', DeprecatedWarning)
8
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/falcon/api_helpers.py b/falcon/api_helpers.py
--- a/falcon/api_helpers.py
+++ b/falcon/api_helpers.py
@@ -1,7 +1,6 @@
-from .app_helpers import *  # NOQA
+import warnings
 
-# TODO deprecate
-# import warnings
-# from .util.deprecation import DeprecatedWarning
+from .app_helpers import *  # NOQA
+from .util.deprecation import DeprecatedWarning
 
-# warnings.warn('The api_helpers module was renamed to app_helpers.', DeprecatedWarning)
+warnings.warn('The api_helpers module was renamed to app_helpers.', DeprecatedWarning)

{"golden_diff": "diff --git a/falcon/api_helpers.py b/falcon/api_helpers.py\n--- a/falcon/api_helpers.py\n+++ b/falcon/api_helpers.py\n@@ -1,7 +1,6 @@\n-from .app_helpers import *  # NOQA\n+import warnings\n \n-# TODO deprecate\n-# import warnings\n-# from .util.deprecation import DeprecatedWarning\n+from .app_helpers import *  # NOQA\n+from .util.deprecation import DeprecatedWarning\n \n-# warnings.warn('The api_helpers module was renamed to app_helpers.', DeprecatedWarning)\n+warnings.warn('The api_helpers module was renamed to app_helpers.', DeprecatedWarning)\n", "issue": "Deprecate falcon.api_helpers\nSee https://github.com/falconry/falcon/issues/1902.\r\n\r\nStarting with 3.1, mark `falcon.api_helpers` as deprecated. We could employ module-level `__getattr__` or redecorate re-imported functions.\n", "before_files": [{"content": "from .app_helpers import *  # NOQA\n\n# TODO deprecate\n# import warnings\n# from .util.deprecation import DeprecatedWarning\n\n# warnings.warn('The api_helpers module was renamed to app_helpers.', DeprecatedWarning)\n", "path": "falcon/api_helpers.py"}], "after_files": [{"content": "import warnings\n\nfrom .app_helpers import *  # NOQA\nfrom .util.deprecation import DeprecatedWarning\n\nwarnings.warn('The api_helpers module was renamed to app_helpers.', DeprecatedWarning)\n", "path": "falcon/api_helpers.py"}]}