fix pre-commit hook failing rubocop on non-ruby files #7046
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What was the end-user or developer problem that led to this PR?
If you changed a man page, it was force-feeding that to rubocop when committing, and it would fail every line as unparseable.
What is your fix for the problem, implemented in this PR?
Add the rubocop flag that tells it to apply file-type filters to the list of files passed on the command line.
Make sure the following tasks are checked