MFC r261597, r261598 and r261599:

Apple touchpad manual page fixes:
- Add manual page for wsp driver
- Update atp driver manual page
- Install atp manual page for all platforms
MFC: r261584

In IPv6 code examples, use the correct v6 socket.
MFC: r261611

Add some context for the "kldload sem" command; minor other improvements.

PR:		183650
Submitted by:	Bjorn Heidotting
[automated] Merge in upstream-github/stable/9