Made a few grammatical changes (#29489)

24a12894 · Mike Hatch · Todd Volkert · c1a118bc · 24a12894
Commit 24a12894 authored Jul 28, 2019 by Mike Hatch Committed by Todd Volkert Jul 28, 2019
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CONTRIBUTING.md CONTRIBUTING.md +3 -3

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--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -43,12 +43,12 @@ presented.
 3. [Setting up your engine development environment](https://github.com/flutter/flutter/wiki/Setting-up-the-Engine-development-environment),
   which describes the steps you need to configure your computer to
   work on Flutter's engine. If you only want to write code for the
-   Flutter framework, you can skip this step. Flutter's engine uses
+   Flutter framework, you can skip this step. Flutter's engine mainly
-   mainly C++, Java, and ObjectiveC.
+   uses C++, Java, and Objective-C.
 4. [Setting up your framework development environment](https://github.com/flutter/flutter/wiki/Setting-up-the-Framework-development-environment),
   which describes the steps you need to configure your computer to
-   work on Flutter's framework. Flutter's framework uses mainly Dart.
+   work on Flutter's framework. Flutter's framework mainly uses Dart.
 5. [Tree hygiene](https://github.com/flutter/flutter/wiki/Tree-hygiene),
   which covers how to land a PR, how to do code review, how to