docs(ruleset): fix documentation errors in ruleset resources

- Add missing allowed_merge_methods field to pull_request section
- Fix merge_queue fields from Required to Optional with defaults
- Fix actor_id to show Optional with note about DeployKey
- Add DeployKey to actor_type enum list
- Add protected field to conditions.repository_name
- Fix required_code_scanning_tool anchor link
- Remove duplicate do_not_enforce_on_create

Author: deiga