update copy

Author: cassgvp

docs/tut/3-3-play-with-this-page.md

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 This page is a safe space for you to practice contributing to documentation. I was far more intimidated by the prospect of inserting my words into someone else's work than I was creating my own from scratch, so for these tutorials I've decided to show you things this way round - contribute first, then make your own.
 
-Once you have contributed to someone else's documentation (and seen how easy it is), you may find it easier to envisage your own work as a collaborative, community effort (assuming that's what you are after), and help ease others into contributing to your documentation.
+Once you have contributed to someone else's documentation (and seen how easy it is), you may find it easier to envisage your own work as a collaborative, community effort (assuming that's what you are after), and help ease others into the contribution process.
 
 ## What to do
 
@@ -36,26 +36,26 @@ When I have accepted your pull request, you will have a permanent (version contr
 
 We, the undersigned, have submitted a pull request to this repository:
 
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 ## You did it!