Update entry-functions.md to remove Markdown extension from Dev Porta…

…l links (MystenLabs#3529)

* Update entry-functions.md

* Update entry-functions.md

doc/book/src/basics/entry-functions.md

@@ -1,6 +1,6 @@
 # Entry Functions
 
-An [entry function](https://docs.sui.io/build/move/index.md#entry-functions) visibility modifier allows a function to be called directly (eg in transaction). It is combinable with other
+An [entry function](https://docs.sui.io/build/move#entry-functions) visibility modifier allows a function to be called directly (eg in transaction). It is combinable with other
 visibility modifiers, such as `public` which allows calling from other modules) and `public(friend)` for calling from *friend* modules.
 
 ```move