tools/gen-cpydiff.py: Adjust subsections to sentence case.
@@ -51,7 +51,7 @@ INDEX = 'index.rst'
HEADER = '.. This document was generated by tools/gen-cpydiff.py\n\n'
UIMPORTLIST = {'array', 'struct', 'collections', 'json'}
-CLASSMAP = {'Core': 'Core Language', 'Types': 'Builtin Types'}
+CLASSMAP = {'Core': 'Core language', 'Types': 'Builtin types'}
INDEXPRIORITY = ['syntax', 'core_language', 'builtin_types', 'modules']
RSTCHARS = ['=', '-', '~', '`', ':']
SPLIT = '"""\n|categories: |description: |cause: |workaround: '
