docs: update layout.html

(cherry picked from commit 1a7c79b)

Author: james

docs/language/global-sphinx-files/_templates/layout.html

@@ -60,7 +60,7 @@
             <div class="linkcontainer">
                 <div class="linkbar">
                     <a href="https://help.semmle.com/QL/learn-ql/" target="_blank">Learn QL</a>
-                    <a href="https://help.semmle.com/QL/ql-training/training-index.html" target="_blank">QL training</a>
+                    <a href="https://help.semmle.com/QL/learn-ql/ql-training.html" target="_blank">QL for variant analysis</a>
                     <a href="https://help.semmle.com/QL/ql-tools.html" target="_blank">QL tools</a>
                     <a href="https://help.semmle.com/QL/ql-explore-queries.html" target="_blank">Queries</a>
                     <a href="https://help.semmle.com/QL/ql-reference-topics.html" target="_blank">Reference</a>