Add "repack" command to tdbtool documentation.

The original commit 'Add "repack" command to tdbtool.' only added
the documentation to docs-xml/manpages-3/tdbtool.8.xml and forgot
about lib/tdb/manpages/tdbtool.8.xml .

Reviewed-by: Christian Ambach <ambi@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
tdb: Fix typos.

Reviewed-by: Christian Ambach <ambi@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>

Autobuild-User(master): Volker Lendecke <vl@samba.org>
Autobuild-Date(master): Fri Jun  7 15:18:47 CEST 2013 on sn-devel-104