Fix redundant comments in fmgr.c

Hi,

I found some possible redundant comments in fmgr.c

1.
fmgr_symbol(Oid functionId, char **mod, char **fn)
{
HeapTuple procedureTuple;
Form_pg_proc procedureStruct;
bool isnull;
Datum prosrcattr;
Datum probinattr;
- /* Otherwise we need the pg_proc entry */
procedureTuple = SearchSysCache1(PROCOID, ObjectIdGetDatum(functionId));

I guess the comment here was miscopied from fmgr_info_cxt_security:

2.
if (!HeapTupleIsValid(procedureTuple))
elog(ERROR, "cache lookup failed for function %u", functionId);
procedureStruct = (Form_pg_proc) GETSTRUCT(procedureTuple);
- /*
- */

Best regards,
houzj