Fix typo/error in CONTRIBUTING.md (#5559)

As opposed to most of the possessive forms, `it's` does not mean something that belongs to `it`. `it's` is a contraction of `it is`, and the correct way to write something that belongs to `it` is `its`.
github-linguist · Sep 7, 2021 · f7b64b5 · f7b64b5
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@@ -150,7 +150,7 @@ Once the bug has been fixed upstream, we'll pick it up for GitHub in the next re
 ## Changing the source of a syntax highlighting grammar
 
 We'd like to ensure Linguist and GitHub.com are using the latest and greatest grammars that are consistent with the current usage but understand that sometimes a grammar can lag behind the evolution of a language or even stop being developed.
-This often results in someone grasping the opportunity to create a newer and better and more actively maintained grammar, and we'd love to use it and pass on it's functionality to our users.
+This often results in someone grasping the opportunity to create a newer and better and more actively maintained grammar, and we'd love to use it and pass on its functionality to our users.
 
 Switching the source of a grammar is really easy: