Remove cache_plan argument comments to ri_PlanCheck

Hi, hackers

I found that the cache_plan argument to ri_PlanCheck already been remove since
5b7ba75f7ff854003231e8099e3038c7e2eba875. I think we can remove the comments
tor cache_plan to ri_PlanCheck.

diff --git a/src/backend/utils/adt/ri_triggers.c b/src/backend/utils/adt/ri_triggers.c
index 7e2b2e3dd6..02b1a3868f 100644
--- a/src/backend/utils/adt/ri_triggers.c
+++ b/src/backend/utils/adt/ri_triggers.c
@@ -2130,9 +2130,6 @@ InvalidateConstraintCacheCallBack(Datum arg, int cacheid, uint32 hashvalue)

/*
* Prepare execution plan for a query to enforce an RI restriction
- *
- * If cache_plan is true, the plan is saved into our plan hashtable
- * so that we don't need to plan it again.
*/
static SPIPlanPtr
ri_PlanCheck(const char *querystr, int nargs, Oid *argtypes,

--
Best regards
Japin Li
ChengDu WenWu Information Technology Co.,Ltd.