Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Hide the implementation details about multiple threading libraries
from the synopses of pthread*(3) manpages.

Reviewed by: deischen, davidxu

Fixed markup bugs.
Spell function correctly when talking about restarting after a signal.

Add an implementation of pthread_rwlock_timed{rd,wr}lock() to libthr with
attendant documentation.