Minor fixes in errata page.

Author: rossant

errata.md

@@ -1,6 +1,8 @@
+# Errata
+
 You can report inaccuracies or errors in the [GitHub issue tracker](https://github.com/ipython-books/cookbook-code/issues). Even better, propose your own corrections by submitting a pull request!
 
 * [Erratum #1](https://github.com/ipython-books/cookbook-code/pull/1) in [Featured Recipe 1](http://ipython-books.github.io/featured-01.html): *Correction about strides and copying*, by [Chris Beaumont](https://github.com/ChrisBeaumont).
 * [Erratum #2](https://github.com/ipython-books/cookbook-code/issues/2) in [Featured Recipe 1](http://ipython-books.github.io/featured-01.html): *Precision on explanation of shared memory*, by [Michael Droettboom](https://github.com/mdboom).
 * [Erratum #3](https://github.com/ipython-books/cookbook-code/issues/3) in [recipe 4.9](http://nbviewer.ipython.org/github/ipython-books/cookbook-code/blob/master/notebooks/chapter04_optimization/09_memmap.ipynb): *Added file mode in `memmap`*, by [Renaud Blanch](http://iihm.imag.fr/blanch/).
-* [Erratum #9](https://github.com/ipython-books/cookbook-code/pull/9) in [recipe 7.8](http://nbviewer.ipython.org/github/ipython-books/cookbook-code/blob/master/notebooks/chapter07_stats/08_r.ipynb): *Replaced old `rmagic` IPython extension by new `rpy2.ipython` for the `%R` magic command, by [@mpelko](https://github.com/mpelko).
+* [Erratum #9](https://github.com/ipython-books/cookbook-code/pull/9) in [recipe 7.8](http://nbviewer.ipython.org/github/ipython-books/cookbook-code/blob/master/notebooks/chapter07_stats/08_r.ipynb): *Replaced old `rmagic` IPython extension by new `rpy2.ipython` for the `%R` magic command*, by [@mpelko](https://github.com/mpelko).