Docs: Update documentation for branch rules with a wildcard
Context
The Protected branches > Use wildcard rules section of the docs contains detailed documentation for wildcard usage when creating a branch rule.
However, the Branch rules section of the docs does not have the same level of detail, or even a link to the Use wildcard rules documentation.
The Branch rules section should have details about what wildcards are allowed, or link back to Protected branches > Use wildcard rules so users have guidance on what options are available when creating branch rules with wildcards.
The Protected branches section is being removed in #537081 and !189974 (merged) in lieu of Branch rules. The documentation should be updated accordingly.
Edited by Alyssa Trinh