ssh_config.5: Remove ambigious dot

[Klemens Nanni]

no is the default, not (yes or no).

diff --git a/usr.bin/ssh/ssh_config.5 b/usr.bin/ssh/ssh_config.5
index 016adbc7343..799af3a4190 100644
--- a/usr.bin/ssh/ssh_config.5
+++ b/usr.bin/ssh/ssh_config.5
@@ -1147,7 +1147,7 @@ However, this option disables host authentication for 
localhost.
The argument to this keyword must be
.Cm yes
or
-.Cm no .
+.Cm no
(the default).
.It Cm NumberOfPasswordPrompts
Specifies the number of password prompts before giving up.