pgsql: Move comment about sun cc's __machine_rw_barrier being a full ba

Move comment about sun cc's __machine_rw_barrier being a full barrier.

I'd accidentally written the comment besides the read barrier, instead
of the full barrier, implementation.

Noticed by Oskari Saarenmaa

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/93be0950070b5bcb22600cb1cbb62f93c058a5dd

Modified Files
--------------
src/include/port/atomics/generic-sunpro.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

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