[Docs] Fix up small typo in code style docs

CONTRIBUTING.md

@@ -73,7 +73,7 @@ Facebook has a [bounty program](https://www.facebook.com/whitehat/) for the safe
 * When wrapping opening tags over multiple lines, place one prop per line
 * `{}` of props should hug their values (no spaces)
 * Place the closing `>` of opening tags on the same line as the last prop
-* Place the closing `/>` of self-closing tags on their own line and left-align them wih the opening `<`
+* Place the closing `/>` of self-closing tags on their own line and left-align them with the opening `<`
 
 #### Objective-C