use reference links in the Documentation template (TYPO3-Documentation#1178)

The referenced help sites can be linked by means of tsref.

---------

Co-authored-by: Lina Wolf <48202465+linawolf@users.noreply.github.com>

Author: franzholz

packages/typo3-guides-cli/resources/templates/rst/GetHelp.rst.twig

@@ -6,8 +6,8 @@
 Where to get help
 =================
 
-You can get help in the TYPO3 Slack https://typo3.org/community/meet/chat-slack,
-Ask a question in the official TYPO3 forum, https://talk.typo3.org/c/typo3-questions/19
+You can get help in the `TYPO3 Slack <https://typo3.org/community/meet/chat-slack>`_.
+Ask a question in the official `TYPO3 forum <https://talk.typo3.org/c/typo3-questions/19>_`
 or contact the extension author.
 
 ..  _report-issues: