docs/25743: Trivial typographic error in ssh.1

[Kevin Steves]

On Wed, 14 Mar 2001, David Wolfskill wrote:
:  If this flag is set to
:  .Dq yes ,
:  .Nm
: -ssh will never automatically add host keys to the
: +will never automatically add host keys to the

thanks!  but we beat you, fixed in january :)

it's always good to check out the latest version when reporting stuff.