Remove heading line from states (A-B)

This cleans up some ugliness from the sphinx autosummary. See
http://docs.saltstack.com/en/latest/ref/states/all/index.html for
examples of the "====" line appearing.
Fixing #18181
#18183 Fixing minor typo
Merge pull request #18193 from dmyerscough/develop

Fixing #18181
Merge pull request #18192 from terminalmage/quickfix

Remove heading line from states (A-B)