Update docs/_Sidebar.md

Co-authored-by: softworkz <4985349+softworkz@users.noreply.github.com>

Author: niteshsinghal85

docs/_Sidebar.md

@@ -23,7 +23,7 @@
 - [Startup-Methods](Using/Startup-Methods.md)
 - [Debugging](Using/Debugging.md)
 - [Package Building](Using/Package-Building.md)
-- [Custom Main](Using/Custom_main.md)
+- [Adding a `custom_main.js`](Using/Custom_main.md)
 
 # API Reference