Simpify filter headers.

README.md

@@ -23,8 +23,7 @@ A collection of cool hidden and not so hidden features of Git and GitHub. This c
   - [Cross-Link Issues](#cross-link-issues)
   - [Locking Conversations](#locking-conversations)
   - [CI Status on Pull Requests](#ci-status-on-pull-requests)
-  - [Negative filters in Issues](#negative-filters-in-issues)
-  - [Merged pull requests filter](#merged-pull-requests-filter)
+  - [Filters](#filters)
   - [Syntax Highlighting in Markdown Files](#syntax-highlighting-in-markdown-files)
   - [Emojis](#emojis)
   - [Images/GIFs](#imagesgifs)
@@ -286,7 +285,7 @@ If set up correctly, every time you receive a Pull Request, [Travis CI](https://
 
 [*Read more about the commit status API.*](https://github.com/blog/1227-commit-status-api)
 
-### Negative filters in Issues
+### Filters
 
 Both issues and pull requests allow filtering in the user interface.
 
@@ -302,10 +301,6 @@ Additionally, this also works for pull requests:
 
 `is:pr -label:activerecord`
 
-[*Read more about searching issues.*](https://help.github.com/articles/searching-issues)
-
-### Merged pull requests filter
-
 Github has tabs for displaying open or closed issues and pull requests but you
 can also see merged pull requests.  Just put the following in the filter: