fix getting started URL (#8034)

* fix getting started URL

* ref to reST for getting started

* doc_getting_started_intro

about/introduction.rst

@@ -22,7 +22,7 @@ Before you start
 
 The :ref:`Tutorials and resources <doc_community_tutorials>` page lists
 video tutorials contributed by the community. If you prefer video to text,
-consider checking them out. Otherwise, :ref:`Getting Started <sec-learn>`
+consider checking them out. Otherwise, :ref:`Getting Started <doc_getting_started_intro>`
 is a great starting point.
 
 In case you have trouble with one of the tutorials or your project,

getting_started/introduction/index.rst

@@ -2,6 +2,8 @@
    started series, answering questions like "do I want to learn Godot?", "how
    does it look and feel?", "how does it work?", and "how do I best learn it?".
 
+.. _doc_getting_started_intro:
+
 Introduction
 ============