Problem: Cannot use modifiers before :-Ntabmove.
Solution: Check backwards from the command instead of checking from the
start of the command line. Slightly adjust docs to make them
more consistent (zeertzjq).
closes: #14289
Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>