correct whitespace errors in readme files

Fix the trailing whitespace and leading spaces
before tabs in the readme files.

Change-Id: If20e528ddb28f82e4d3d1b1f03dec8670f914afc
Reviewed-on: http://gerrit.openafs.org/8877
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Ken Dreyer <ktdreyer@ktdreyer.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>