Fix help link in issue template

Summary:
Fixes #17078.

cc hramos.
Closes #17079

Differential Revision: D6492031

Pulled By: hramos

fbshipit-source-id: 2e525938252053e654bfc4bd2599c1286d14f9b3

Author: charpeni

.github/ISSUE_TEMPLATE.md

@@ -16,7 +16,7 @@
   If you answered "No":
 
     We use GitHub Issues exclusively for tracking bugs in React Native. If you're looking for help,
-    the Community page at http://facebook.github.io/react-native/support.html list various resources 
+    the Community page at http://facebook.github.io/react-native/help.html list various resources 
     that should help you get started.
 
   Now scroll below!