Fix come incorrect elog() messages in aclchk.c

Three error strings used with cache lookup failures were referring to
incorrect object types for ACL checks:
- Schemas
- Types
- Foreign Servers
There errors should never be triggered, but if they do incorrect
information would be reported.

Author: Justin Pryzby
Discussion: https://postgr.es/m/20221222153041.GN1153@telsasoft.com
Backpatch-through: 11

src/backend/catalog/aclchk.c

@@ -4369,7 +4369,7 @@ recordExtObjInitPriv(Oid objoid, Oid classoid)
 
 		tuple = SearchSysCache1(FOREIGNSERVEROID, ObjectIdGetDatum(objoid));
 		if (!HeapTupleIsValid(tuple))
-			elog(ERROR, "cache lookup failed for foreign data wrapper %u",
+			elog(ERROR, "cache lookup failed for foreign server %u",
 				 objoid);
 
 		aclDatum = SysCacheGetAttr(FOREIGNSERVEROID, tuple,
@@ -4455,7 +4455,7 @@ recordExtObjInitPriv(Oid objoid, Oid classoid)
 
 		tuple = SearchSysCache1(NAMESPACEOID, ObjectIdGetDatum(objoid));
 		if (!HeapTupleIsValid(tuple))
-			elog(ERROR, "cache lookup failed for function %u", objoid);
+			elog(ERROR, "cache lookup failed for schema %u", objoid);
 
 		aclDatum = SysCacheGetAttr(NAMESPACEOID, tuple,
 								   Anum_pg_namespace_nspacl, &isNull);
@@ -4497,7 +4497,7 @@ recordExtObjInitPriv(Oid objoid, Oid classoid)
 
 		tuple = SearchSysCache1(TYPEOID, ObjectIdGetDatum(objoid));
 		if (!HeapTupleIsValid(tuple))
-			elog(ERROR, "cache lookup failed for function %u", objoid);
+			elog(ERROR, "cache lookup failed for type %u", objoid);
 
 		aclDatum = SysCacheGetAttr(TYPEOID, tuple, Anum_pg_type_typacl,
 								   &isNull);