Update the "first appeared in" version in several manual pages.

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation

lib/libc/gen/sem_timedwait.3

@@ -34,7 +34,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd February 28, 2017
+.Dd May 24, 2017
 .Dt SEM_TIMEDWAIT 3
 .Os
 .Sh NAME
@@ -160,4 +160,4 @@ function first appeared in
 The
 .Fn sem_clockwait_np
 function first appeared in
-.Fx 12.0 .
+.Fx 11.1 .

lib/libc/sys/fsync.2

@@ -34,7 +34,7 @@
 .\"     @(#)fsync.2	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"
-.Dd August 17, 2016
+.Dd May 24, 2017
 .Dt FSYNC 2
 .Os
 .Sh NAME
@@ -119,7 +119,7 @@ system call appeared in
 The
 .Fn fdatasync
 system call appeared in
-.Fx 12.0
+.Fx 11.1 .
 .Sh BUGS
 The
 .Fn fdatasync