man pages: add missing commas between subordinate and main clauses

jmc@ dislikes a comma before "then" in a conditional, so leave those
untouched.

ok jmc@

Update my email address.

use fancy .In macro for includes. from Jan Klemkow. ok jmc schwarze

tweak previous;

Add pthread barrier support.

Implementation and documentation for:
- pthread_barrier_init()
- pthread_barrier_destroy()
- pthread_barrier_wait()
- pthread_barrierattr_init()
- pthread_barrierat

Add pthread barrier support.

Implementation and documentation for:
- pthread_barrier_init()
- pthread_barrier_destroy()
- pthread_barrier_wait()
- pthread_barrierattr_init()
- pthread_barrierattr_destroy()
- pthread_barrierattr_getpshared()
- pthread_barrierattr_setpshared()

Currently only private barriers are supported.

Okay guenther@.

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