chore(ads-admanager): disable docs warning errors

Author: noahdietz

.librarian/generator-input/client-post-processing/allow-docs-warnings.yaml

@@ -17,6 +17,12 @@ url: https://github.com/googleapis/gapic-generator-python/issues/2490
 # is annoying, but that's what synthtool expects and it's not worth fixing that
 # at this stage.
 replacements:
+  - paths: [
+      packages/google-ads-admanager/noxfile.py,
+    ]
+    before: '        "-W",  # warnings as errors\n'
+    after: ''
+    count: 1
   - paths: [
       packages/google-analytics-data/noxfile.py,
     ]

packages/google-ads-admanager/noxfile.py

@@ -390,7 +390,6 @@ def docs(session):
     shutil.rmtree(os.path.join("docs", "_build"), ignore_errors=True)
     session.run(
         "sphinx-build",
-        "-W",  # warnings as errors
         "-T",  # show full traceback on exception
         "-N",  # no colors
         "-b",