Fix a couple minor typos

In commit f0e44751, GetIndexOpClass was renamed to ResolveOpClass, but
the comment in typecmds.c didn't get the memo.

In objectaddress.c, missing 'of' in a comment.

Both noticed by Vik Fearing, patch is mine though.

src/backend/catalog/objectaddress.c

@@ -2062,7 +2062,7 @@ pg_get_object_address(PG_FUNCTION_ARGS)
 	}
 
 	/*
-	 * get_object_address is pretty sensitive to the length its input lists;
+	 * get_object_address is pretty sensitive to the length of its input lists;
 	 * check that they're what it wants.
 	 */
 	switch (type)

src/backend/commands/typecmds.c

@@ -1990,7 +1990,7 @@ findRangeSubOpclass(List *opcname, Oid subtype)
 		opcid = GetDefaultOpClass(subtype, BTREE_AM_OID);
 		if (!OidIsValid(opcid))
 		{
-			/* We spell the error message identically to GetIndexOpClass */
+			/* We spell the error message identically to ResolveOpClass */
 			ereport(ERROR,
 					(errcode(ERRCODE_UNDEFINED_OBJECT),
 					 errmsg("data type %s has no default operator class for access method \"%s\"",