Merge pull request #2039 from changeworld/patch-3

Fix typo

Author: TrishaMc

docs/rtvs/installer.md

@@ -24,7 +24,7 @@ Thank you for installing R Tools for Visual Studio (RTVS)! Check it out and let
 - [How to install R Tools for Visual Studio](installing-r-tools-for-visual-studio.md)
 - [Submit and browse bugs and feature requests on GitHib](https://github.com/Microsoft/RTVS/issues)
 - [Explore and contribute to the source code](https://github.com/Microsoft/RTVS/blob/master/LICENSE)
-- To send feedback without using Github (which is preferred), use the **R Tools > Feedback** menu in Visual Studio.
+- To send feedback without using GitHub (which is preferred), use the **R Tools > Feedback** menu in Visual Studio.
 
 ## Microsoft R distributions