git: atomic.9: Some small updates

[Aaron LI]

commit 2f45ab904bbc7cbcc4f624cb5512f60814fb7977
Author: Aaron LI <aly at aaronly.me>
Date:   Sun Jan 14 15:31:51 2024 +0800

    atomic.9: Some small updates
    
    - Add some more description obtained from FreeBSD.
    - Uncomment the 64-bit variant contents.
    - Minor wording tweaks.

Summary of changes:
 share/man/man9/atomic.9 | 28 +++++++++++++++++++++-------
 1 file changed, 21 insertions(+), 7 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/2f45ab904bbc7cbcc4f624cb5512f60814fb7977


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