git: kernel - Update umtx documentation

[Matthew Dillon]

commit f554ca21dcb97a996e96a97550bc26b52367656a
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Mon Nov 6 22:08:21 2017 -0800

    kernel - Update umtx documentation
    
    * Update the umtx(2) documentation with better examples and include
      fine detail and warnings on use.
    
    * Update the fork(2) documentation to include warnings about using
      the function in threaded programs.

Summary of changes:
 lib/libc/sys/fork.2 |  32 ++++++++++++
 lib/libc/sys/umtx.2 | 140 +++++++++++++++++++++++++---------------------------
 2 files changed, 99 insertions(+), 73 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/f554ca21dcb97a996e96a97550bc26b52367656a


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