If one does a "man ssh", then there is a section entitled "X11 and TCP
forwarding"  which makes reference to the '-X' and '-x' command-line options,
and to the 'ForwardX11' variable.
However this section makes no reference to the '-Y' command-line option, nor to
the 'ForwardX11Trusted' variable.

I suggest that mention should be made.

Later in the man page the command-line options are described. Whilst the '-X'
option is described in some detail, the '-Y' option lacks description.

I suggest that the '-Y' option should be described in more detail.

I realise that one may look at the "man ssh_config" page for more details of the
options, but I believe that the command-line options for ssh should be
documented in "man ssh".