Minor changes as per feedback from @frangio

CONTRIBUTING.md

@@ -20,11 +20,12 @@ As a contributor, you are expected to fork this repository, work on your own for
 1) Make sure your fork is up to date with the main repository:
 
 ```
-cd my-zeppelin-solidity-fork
+cd zeppelin-solidity
 git fetch upstream
 git checkout development
 git pull --rebase upstream development
 ```
+NOTE: The directory `zeppelin-solidity` represents your fork's local copy.
 
 2) Branch out from `development` into `fix/some-bug-#123`:
 (Postfixing #123 will associate your PR with the issue #123 and make everyone's life easier =D)
@@ -35,7 +36,7 @@ git checkout -b fix/some-bug-#123
 3) Make your changes, add your files, commit and push to your fork.
 
 ```
-git add -A
+git add SomeFile.js
 git commit "Fix some bug #123"
 git push origin fix/some-bug-#123
 ```