Support :mrjob-opt: role in options_extension
Update docs to use mrjob-opt role
Improve markup
Improve mrjob-opt anchor names
Remove dead code
Fix issue with reference table missing options with a very suboptimal solution
Partial solution to the pending_xref problem
Fix documentation and silence spurious error messages
Merge pull request #714 from irskep/mrjob-opt-role

:mrjob-opt:`some_value`