Don't collapse Lightning API section (#10545)

Author: kaushikb11

docs/source/_templates/layout.html

@@ -4,7 +4,7 @@
 {% block footer %}
 {{ super() }}
 <script script type="text/javascript">
-  var collapsedSections = ['Best practices', 'Lightning API', 'Optional extensions', 'Tutorials', 'API References', 'Bolts', 'Examples', 'Partner Domain Frameworks', 'Community'];
+  var collapsedSections = ['Best practices', 'Optional extensions', 'Tutorials', 'API References', 'Bolts', 'Examples', 'Partner Domain Frameworks', 'Community'];
 </script>
 
 {% endblock %}