Update UserFocus.yml (#115)

Added to existing rule.

styles/Splunk/UserFocus.yml

@@ -1,5 +1,5 @@
 extends: existence
-message: "Rewrite to focus on what the user can do rather than what the product does or how the document is laid out."
+message: "Rewrite to focus on what the user can do, rather than what the product does or how the document is laid out."
 link: 'https://docs.splunk.com/Documentation/StyleGuide/current/StyleGuide/AwordaboutSplunkdocs#User-focused'
 ignorecase: true
 level: warning
@@ -8,6 +8,8 @@ tokens:
   - enables you to
   - lets you
   - The purpose of this document is
+  - The purpose of this page is
+  - The purpose of this topic is
   - This document (?:describes|explains|shows)
   - This page (?:describes|explains|shows)
   - This section (?:describes|explains|shows)