Typo fix THANKS message

Backport of: http://review.gluster.org/8174

BUG: 1142046
Change-Id: Ibfb1b9ec6784141ff59ee39df76fac2d7ce73cc6
Reviewed-on: http://review.gluster.org/8745
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Humble Devassy Chirammal <humble.devassy@gmail.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>