doc: Move relevant files out of legacy.

Change-Id: Iff9166dd7baa3d60b70ffab5ce9a692d211fa4fb
BUG: 811311
Signed-off-by: Vijay Bellur <vbellur@redhat.com>
Reviewed-on: http://review.gluster.org/5091
Reviewed-by: Justin Clift <jclift@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>