Update comments in functions for statistics import in postgres_fdw.c

[Etsuro Fujita]

Hi,

I did s/attname/remote_attname/ to a comment in match_attrmap(), for
clarity, and added a comment to import_fetched_statistics().  I also
tweaked the comments for each of the two functions.

Best regards,
Etsuro Fujita

update-comments-in-stat-import-functions.patch
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