tools: ynl: add short doc to class YnlFamily

The class is quite long. It's getting hard to find the user-facing
methods. Add a short doc at the class level explaining the main API.

Link: https://patch.msgid.link/20260310005337.3594225-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2026-03-09 17:53:35 -07:00
commit 8bbcfce5db