The former usage function is substituted, although not as the -h and -help
parameter handler yet.

Purpose: Use Pod::Usage to handle documentation printing in an integrated
way.
Signed-off-by: NTomasz Warniełło <tomasz.warniello@gmail.com>
Tested-by: NRandy Dunlap <rdunlap@infradead.org>
Acked-by: NRandy Dunlap <rdunlap@infradead.org>
Disliked-by: NAkira Yokosawa <akiyks@gmail.com>
Link: https://lore.kernel.org/r/20220218181628.1411551-3-tomasz.warniello@gmail.comSigned-off-by: NJonathan Corbet <corbet@lwn.net>