thr_self.2: Fix some typos in the thread identifier range

Reported by:	kaktus
Approved by:	bcr (mentor)
Differential Revision:	https://reviews.freebsd.org/D23936

lib/libc/sys/thr_self.2

@@ -28,7 +28,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd June 1, 2016
+.Dd March 3, 2020
 .Dt THR_SELF 2
 .Os
 .Sh NAME
@@ -49,7 +49,7 @@ kernel-scheduled thread in the variable pointed by the argument
 .Pp
 The thread identifier is an integer in the range from
 .Dv PID_MAX + 2
-(10002) to
+(100001) to
 .Dv INT_MAX .
 The thread identifier is guaranteed to be unique at any given time,
 for each running thread in the system.