fix links

CONTRIBUTING.md

@@ -29,9 +29,8 b' Some guidelines on contributing to IPython:'
     - bugfixes should include regression tests
     - new behavior should at least get minimal exercise
 * New features and backwards-incompatible changes should be documented by adding
-  a new file to the [development](docs/source/whatsnew/development) directory,
-  see [the README.md there](docs/source/whatsnew/development/README.md) for
-  details.
+  a new file to the [pr](docs/source/whatsnew/pr) directory, see [the README.md
+  there](docs/source/whatsnew/pr/README.md) for details.
 
 [Travis](http://travis-ci.org/#!/ipython/ipython) does a pretty good job testing IPython and Pull Requests,
 but it may make sense to manually perform tests (possibly with our `test_pr` script),

docs/source/whatsnew/pr/README.md

@@ -7,8 +7,8 b' directory documenting this change as a part of your Pull Request.'
 
 This will allow multiple Pull Requests to do the same without conflicting with
 one another. Periodically, IPython developers with commit rights will run a
-script and populate [developement.rst](../developement.rst)  with the contents
-of this directory, and clean it up.
+script and populate [development.rst](../development.rst)
+with the contents of this directory, and clean it up.
 
 Files which describe new features can have any name, such as
 `antigravity-feature.rst`, whereas backwards incompatible changes should have a