pgsql: Fix comment atomics.h.

Fix comment atomics.h.

I appear to accidentally have switched the comments for
pg_atomic_write_u32 and pg_atomic_read_u32 around. Also fix some minor
typos I found while fixing.

Noticed-By: Amit Kapila
Backpatch: 9.5

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/073082bbb1adc4548132915874a001688514e64f

Modified Files
--------------
src/include/port/atomics.h | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)

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