convkeys was mentioned twice. changed the second one to convkeys2

andrey

Reference: /n/sources/patch/applied/auth-convkeys2
Date: Tue Nov 16 04:17:32 CET 2004

--- /sys/man/8/auth	Tue Nov 16 04:17:32 2004
+++ /sys/man/8/auth	Tue Nov 16 04:17:32 2004
@@ -12,7 +12,7 @@
 .RB [ -p ]
 .I keyfile
 .PP
-.B auth/convkeys
+.B auth/convkeys2
 .RB [ -p ]
 .I keyfile
 .PP