[TASK] Call How to Document by this name

We always call it this when we are talking about it

Documentation/_mainMenu.rst.txt

@@ -70,7 +70,7 @@
 *   `Contribution <https://docs.typo3.org/Home/Overview.html>`__
 
     *   :ref:`TYPO3 Core Contribution Guide <t3contribute:recommended-reading>`
-    *   :ref:`Writing documentation <h2document:start>`
+    *   :ref:`How to Document <h2document:start>`
     *   `typo3.org Team <https://docs.typo3.org/m/typo3/team-t3oteam/main/en-us/>`__
     *   :ref:`Content and Marketing Guide <t3content:start>`
     *   :ref:`Language and Writing Guide <t3writing:start>`