fix: 📚 Fix typo in branch protection configuration (require_linear_history to required_linear_history)

Author: ranma2913

docs/github-settings/5. branch-protection.md

@@ -24,7 +24,7 @@ branches:
         require_code_owner_reviews: true
         require_last_push_approval: true
         required_signatures: true
-        require_linear_history: false
+        required_linear_history: false
         bypass_pull_request_allowances:
           apps:
             - Jarvis
@@ -226,7 +226,7 @@ branches:
 branches:
   - name: default
     protection:
-      require_linear_history: false
+      required_linear_history: false
 ...
 ```