Update DontUse.yml (#19)

Added premium app, premium apps, and premium solution (https://splunk.atlassian.net/browse/DOCGUILD-20957)

Author: wordsmeanstuff

Diff for: styles/Splunk/DontUse.yml

@@ -15,6 +15,9 @@ tokens:
   - left
   - note that
   - please
+  - premium app
+  - premium apps
+  - premium solution
   - premium solutions
   - quite
   - realtime