Add information about UIDs as command line arguments to manual pages of
chfn, chsh, and su, since they accept them now.
Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
== SYNOPSIS
-*chfn* [*-f* _full-name_] [*-o* _office_] [*-p* _office-phone_] [*-h* _home-phone_] [*-u*] [*-V*] [_username_]
+*chfn* [*-f* _full-name_] [*-o* _office_] [*-p* _office-phone_] [*-h* _home-phone_] [*-u*] [*-V*] [_username_|_UID_]
== DESCRIPTION
== SYNOPSIS
-*chsh* [*-s* _shell_] [*-l*] [*-h*] [*-V*] [_username_]
+*chsh* [*-s* _shell_] [*-l*] [*-h*] [*-V*] [_username_|_UID_]
== DESCRIPTION
== SYNOPSIS
-*su* [options] [*-*] [_user_ [_argument_...]]
+*su* [options] [*-*] [_user_|_UID_ [_argument_...]]
== DESCRIPTION