index: remove note on creating pages for questions

This is not a thing now that it's not a world editable wiki.

Change-Id: Ie6e97cc1581ea46b023bf1598f8d0ac1f15d2100
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/660115
Reviewed-by: Ian Lance Taylor <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
Commit-Queue: Ian Lance Taylor <[email protected]>

Author: seankhliao

index.md

@@ -10,8 +10,6 @@ If you can't find what you need on this page, see the [list of all pages](All).
 
 See [Questions](Questions).
 
-Please do not ask questions by editing or creating a wiki page.  Any such changes will be silently reverted.
-
 ## Contributing
 
 - If you would like to add a new page, please first open an issue in the [Go issue tracker](https://go.dev/issues/new?title=wiki:) with the prefix `wiki:` to propose the addition. Clearly state why the content does not fit into any of the existing pages.