Merge branch 'mm/keyid-docs' into maint

Very small number of options take a parameter that is optional
(which is not a great UI element as they can only appear at the end
of the command line).  Add notice to documentation of each and
every one of them.

* mm/keyid-docs:
  Documentation: explain optional arguments better
  Documentation/grep: fix documentation of -O
  Documentation: use 'keyid' consistently, not 'key-id'

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