Documentation: stable: clarify patch series prerequisites

Add some clarifications for patches that have dependencies within the
patch series.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Rule: add
Link: https://lore.kernel.org/stable/20230911203628.20068-1-hugo%40hugovil.com
Link: https://lore.kernel.org/r/20230911203628.20068-1-hugo@hugovil.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>