Fix formatting

CONTRIBUTING.md

@@ -468,11 +468,7 @@ Editable notebooks are made available using [Google Colab](https://colab.researc
 
 GitHub does some magic with particular filenames. In particular:
 
-- The first page people see when they go to [our GitHub page](https://github.
-  com/pybamm-team/PyBaMM) displays the contents of [README.md]
-  (https://github.com/pybamm-team/PyBaMM/blob/develop/README.md), which is 
-  written in the [Markdown](https://github.
-  com/adam-p/markdown-here/wiki/Markdown-Cheatsheet) format. Some guidelines can be found [here](https://docs.github.com/articles/about-readmes/).
+- The first page people see when they go to [our GitHub page](https://github.com/pybamm-team/PyBaMM) displays the contents of [README.md](https://github.com/pybamm-team/PyBaMM/blob/develop/README.md), which is written in the [Markdown](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet) format. Some guidelines can be found [here](https://docs.github.com/articles/about-readmes/).
 - The license for using PyBaMM is stored in [LICENSE](https://github.com/pybamm-team/PyBaMM/blob/develop/LICENSE.txt), and [automatically](https://docs.github.com/articles/adding-a-license-to-a-repository/) linked to by GitHub.
 - This file, [CONTRIBUTING.md](https://github.com/pybamm-team/PyBaMM/blob/develop/CONTRIBUTING.md) is recognised as the contribution guidelines and a link is [automatically](https://github.com/blog/1184-contributing-guidelines) displayed when new issues or pull requests are created.