Make mGerrit's presence clearer

I've heard repeatedly that people did not know this app
is included in all AOKP builds. This message is much clearer
to users about mGerrit's location.

Patch Set 2: missing backslash Thanks guys!
Patch Set 3: Correct grammar in summary

Change-Id: Ibaac55f49bacd0627a37766b20f85edcc172a328
Merge "Make mGerrit's presence clearer" into jb-mr1