fix: update description for deprecated squash-merge commit title property in settings.json

Author: madkoo

schema/dereferenced/settings.json

@@ -155,7 +155,7 @@
             },
             "use_squash_pr_title_as_default": {
               "type": "boolean",
-              "description": "Either `true` to allow squash-merge commits to use pull request title, or `false` to use commit message. **This property is closing down. Please use `squash_merge_commit_title` instead.",
+              "description": "Either `true` to allow squash-merge commits to use pull request title, or `false` to use commit message. **This property is closing down. Please use `squash_merge_commit_title` instead.**",
               "default": false,
               "deprecated": true
             },