Prettify PR body

Author: hishamco

.github/workflows/update-submodule.yml

@@ -74,10 +74,16 @@ jobs:
           body: |
             Updated [${{ steps.submodule-new.outputs.repoName }}](${{ steps.submodule-new.outputs.repoUrl }}) from ${{ steps.submodule-new.outputs.oldShort }} to ${{ steps.submodule-new.outputs.newShort }}.
 
+            <details>
+            <summary>Details</summary>
+
+            _This automated submodule update was generated by workflow._ 
+
             - Old commit: [${{ steps.submodule-new.outputs.oldShort }}](${{ steps.submodule-new.outputs.oldCommitUrl }})
             - New commit: [${{ steps.submodule-new.outputs.newShort }}](${{ steps.submodule-new.outputs.newCommitUrl }})
 
             [View changes](${{ steps.submodule-new.outputs.compareUrl }})
+            </details>
           branch: update-submodules
           delete-branch: true
           base: main