pgsql: Remove stale comment on ri_FastPathCheck()

Remove stale comment on ri_FastPathCheck()

The note claiming ri_FastPathCheck() is only used by the ALTER TABLE
validation path is no longer accurate. Rather than reword it, remove
it; the block comment above RI_FKey_check()'s call to the function
already documents when each path is taken, and a duplicated
cross-reference here would only drift out of date again.

Reported-by: Noah Misch <noah(at)leadboat(dot)com>
Reviewed-by: Ayush Tiwari <ayushtiwari(dot)slg01(at)gmail(dot)com>
Discussion: https://postgr.es/m/20260705210533.ee.noahmisch@microsoft.com
Backpatch-through: 19

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/ccfa6c9644132d95c09dd6512643493fb5081c6a

Modified Files
--------------
src/backend/utils/adt/ri_triggers.c | 3 ---
1 file changed, 3 deletions(-)