Cleaned up the loop

Otherwise, the loop just prints the words 'file' and 'found' on separate lines.
Removed duplicate example, updated description of another example.

Removed cat file | grep pattern as cat file is unnecessary.  The command becomes 'grep pattern file' again - which is the same as the first example.

Updated #Advanced description to be more descriptive.
Merge pull request #62 from adelviscio/patch-2

Cleaned up the loop
Merge branch 'master' of github.com:chrisallenlane/cheat

* 'master' of github.com:chrisallenlane/cheat:
  Cleaned up the loop
Merge branch 'patch-4' of https://github.com/adelviscio/cheat into adelviscio-patch-4

* 'patch-4' of https://github.com/adelviscio/cheat:
  Removed duplicate example, updated description of another example.
Fixed a minor typo in the grep cheatsheet.