[vale] reported by reviewdog 🐶 [Google.Headings] 'Install Jupyter kernel' should use sentence-style capitalization. Raw Output: {"message": "[Google.Headings] 'Install Jupyter kernel' should use sentence-style capitalization.", "location": {"path": "doc/source/content-writing/examples-writers/nbsphinx.rst", "range": {"start": {"line": 12, "column": 1}}}, "severity": "WARNING"}