postgres_fdw: Mark statistics import helpers as static

The set_*_arg helper functions in postgres_fdw.c are declared
static, but their definitions omitted the static keyword. Add it to
make their file-local scope explicit and keep the declarations and
definitions consistent.

Also fix a couple of nearby comment typos.

This is a followup to commit 54cd6fc8317.

Author: Fujii Masao <[email protected]>
Reviewed-by: Etsuro Fujita <[email protected]>
Discussion: 
https://postgr.es/m/cahgqgwgjcq4swhmuq9p8uyq7ilkl1qe3ulsdontoq1mrzpu...@mail.gmail.com
Backpatch-through: 19

Branch
------
REL_19_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/2bbec7c49a6c872fdfdddf7ff9ea9dc9cebaef40

Modified Files
--------------
contrib/postgres_fdw/postgres_fdw.c      | 12 ++++++------
src/backend/statistics/attribute_stats.c |  2 +-
src/backend/statistics/relation_stats.c  |  2 +-
3 files changed, 8 insertions(+), 8 deletions(-)

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