Fix README according to settings.py existing comment.

README.md

@@ -238,7 +238,7 @@ Settings
 
 List of available settings in your `settings_local.py` file.
 
-- `MEMBER_MEMBERSHIP_INFO_URL`: Url of the page that explain how to get and renew a membership to your ISP.
+- `MEMBER_MEMBERSHIP_INFO_URL`: Link to a page with information on how to become a member or pay the membership fee
 
 More information
 ================