Update "protect repository tags" curl command to include allowed_to_create

Problem to solve

The curl command for https://docs.gitlab.com/ee/api/protected_tags.html#protect-repository-tags should be updated to include an example of the allowed_to_create parameter.

Discovered through in-page comment: http://disq.us/p/2tbel57

Aside: I've created Polish protected tags API page, crosslink (!113118 - merged) to tidy up some small things on this page; hopefully it will be merged before any of you can answer this question.

Further details

Proposal

Who can address the issue

A member of groupsource code

Other links/references