openssh: sync update document with main

(cherry picked from commit 519496a5985549d2935cf296a709b1e726b1b5e5)
(cherry picked from commit 576b477ba41c9916fae3a83e6b4dd98c682a0c2f)
(cherry picked from commit 35a034250896584a63204f60fa57e6eddca049ac)
(cherry picked from commit f3fd88507489f6b80402ab7a0fb195ca9c708334)
(cherry picked from commit b645ee1815daf96ee9512633b55c423bc897b244)
(cherry picked from commit 438fd19dc327400e5fbcebfcb9fe9361b317e791)