fixed link to documentation on website
removed .html
@@ -27,7 +27,7 @@ in each version of K-9 Mail.
If the app is not behaving like it should, you might find these resources helpful:
-- [User Manual](https://k9mail.github.io/documentation.html)
+- [User Manual](https://k9mail.github.io/documentation)
- [Frequently Asked Questions](https://k9mail.github.io/documentation/faq.html)
- [Support Forum/Mailing List](https://groups.google.com/group/k-9-mail)
