Clean up the GPG docs and mention push rules
What does this MR do?
Clean up the GPG docs and mention push rules.
Related issues
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/42363.
Author's checklist
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Apply the correct labels and milestone -
Correctly apply the product badges and tiers -
Port the MR to EE (or backport from CE): always recommended, required when the ee-compat-check
job fails https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/8975
Review checklist
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Technical writer's review (required) -
Merge the EE-MR first, CE-MR afterwards https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/8975
Edited by Evan Read