Also mention the possibility to create new branches

contributing/updating_the_class_reference.rst

@@ -53,7 +53,7 @@ should however **not be edited directly**, they are generated via a script from
 Getting started with GitHub
 ---------------------------
 
-This section described step-by-step the typical workflow to fork the git repository,
+This section describes step-by-step the typical workflow to fork the git repository,
 or update an existing local clone of your fork, and then prepare a pull request.
 
 Fork Godot Engine
@@ -123,6 +123,17 @@ commit in the upstream branch), you need to *reset* your branch:
 specific to your local branch. So make sure to run this *before* making new
 changes and not afterwards.
 
+Alternatively, you can also keep your own master branch (``origin/master``)
+up-to-date and create new branches when wanting to commit changes to the
+class reference:
+
+::
+
+    git checkout master
+    git branch -d my-previous-doc-branch
+    git pull --rebase upstream/master
+    git checkout -b my-new-doc-branch
+
 In case of doubt, ask for help on our IRC channels, we have some git gurus
 there.