[vale] reported by reviewdog 🐶 [Google.Headings] 'API reference' should use sentence-style capitalization. Raw Output: {"message": "[Google.Headings] 'API reference' should use sentence-style capitalization.", "location": {"path": "doc/source/_autoapi_templates/index.rst", "range": {"start": {"line": 1, "column": 1}}}, "severity": "WARNING"}