Copy edit

Author: lauraclay

CONTRIBUTING.md

@@ -10,7 +10,7 @@ If you find a mistake, bug or other problem, please [open an issue](https://gith
 
 If you fix a mistake, bug or problem or have something to contribute, please create a pull request for each modification. Please consider grouping modifications sensibly, i.e. don't bundle typo fixes in the same pull request as code changes, instead file them separately.
 
-Please note that sometimes things are done for pedagogical reasons so changes which make sense from a software engineering perspective (reducing duplication or making use of more advanced programming language features) may not be suitable to maintain the intended educational value.
+Please note that sometimes things are done for pedagogical reasons, so changes which make sense from a software engineering perspective (reducing duplication or making use of more advanced programming language features) may not be suitable to maintain the intended educational value.
 
 ## Derivatives
 
@@ -22,6 +22,6 @@ Unless otherwise specified, everything in this repository is covered by the foll
 
 [![Creative Commons Licence](http://i.creativecommons.org/l/by-sa/4.0/88x31.png)](http://creativecommons.org/licenses/by-sa/4.0/)
 
-***Example Resource*** by the [Raspberry Pi Foundation](http://www.raspberrypi.org) is licenced under a [Creative Commons Attribution 4.0 International Licence](http://creativecommons.org/licenses/by-sa/4.0/).
+***Getting Started With GPIO Zero*** by the [Raspberry Pi Foundation](http://www.raspberrypi.org) is licenced under a [Creative Commons Attribution 4.0 International Licence](http://creativecommons.org/licenses/by-sa/4.0/).
 
 Based on a work at https://github.com/raspberrypilearning/getting-started-with-gpio-zero