in the offical doc,-F say：
Use separator as the field separator for unaligned output.
but in the psql --help,-F say:
set field separator (default: "|")
if user don't read the offical doc carefully,he can use:
psql -F , -c 'select ...'
But can't get what he want.
It is a bad user Experience.
I make a patch change the help message for -F to:
set field separator for unaligned output (default: "|")
patch for head attached.