Remove backticks breaking pr messages (#16433)

Author: Kordyjan

.github/workflows/language-reference.yaml

@@ -81,7 +81,7 @@ jobs:
           pr_label: area:documentation
           pr_title: Sync with the stable documentation branch
           pr_body: |
-            This pull request is syncing the `main` with changes from `language-reference-stable`.
+            This pull request is syncing the main with changes from language-reference-stable.
 
             It was created automatically after ${{ github.event.head_commit.id }} by @${{ github.event.head_commit.author.username }}
           pr_assignee: ${{ github.event.head_commit.author.username }}