Attempt to fix PR admonition comment syntax

- See broken example at #6748 (comment)

This PR does not need a changelog, as it's a follow up to #6613

.github/boring-cyborg.yml

@@ -46,20 +46,21 @@
 ##### Greetings ########################################################################################################
 # Comment to be posted to welcome users when they open their first PR
 firstPRWelcomeComment: >
+
   > [!CAUTION]
   > The Volto Team has suspended its review of new pull requests from first-time contributors until the [release of Plone 7](https://plone.org/download/release-schedule), which is preliminarily scheduled for the second quarter of 2026.
   > [Read details](https://6.docs.plone.org/volto/contributing/index.html).
   
   Thanks for submitting your first pull request! You are awesome! :hugs:
 
-  <br>If you haven't done so already, read
+  If you haven't done so already, read
   [Plone's Code of Conduct](https://plone.org/foundation/about/materials/foundation-resolutions/code-of-conduct),
   [Contributing to Plone](https://6.docs.plone.org/contributing/index.html),
   [First-time contributors](https://6.docs.plone.org/contributing/first-time.html), and
   [Contributing to Volto](https://6.docs.plone.org/volto/contributing/index.html),
   as this will greatly help the review process.
 
-  <br>Welcome to the Plone community! :tada:
+  Welcome to the Plone community! :tada:
 
 # Comment to be posted to congratulate user on their first merged PR
 firstPRMergeComment: >