[3.1.x] Refs #32412 -- Adjusted beginning of Advice for new contribut…

…ors.

With the goal of guiding folks to the right destination:

* Improved wording of tutorial call-out.
* Added summary of page purpose.
* Added link to Writing code reference doc.

Backport of e733c9a from master

docs/internals/contributing/new-contributors.txt

@@ -5,11 +5,17 @@ Advice for new contributors
 New contributor and not sure what to do? Want to help but just don't know how
 to get started? This is the section for you.
 
-.. admonition:: Basic tools and workflow
+.. admonition:: Get up and running!
 
     If you are new to contributing to Django, the :doc:`/intro/contributing`
     tutorial will give you an introduction to the tools and the workflow.
 
+This page contains more general advice ways you can contribute to Django, and
+how to approach that.
+
+If you are looking for a reference on the details of making code contributions,
+see the :doc:`/internals/contributing/writing-code/index` documentation.
+
 First steps
 ===========