Clean some typos about IVM

[hyongtao-db]

No code changes. Just clean some typos about IVM‘s comments.
Parts of typos are from pg_ivm.
Signed-off-by: Yongtao Huang yongtaoh2022@gmail.com

[my-ship-it]

👍

[yjhjstz]

 -- contain HAVING
 CREATE INCREMENTAL MATERIALIZED VIEW mv_ivm08 AS SELECT i,j,k FROM mv_base_a a INNER JOIN mv_base_b b USING(i) GROUP BY i,j,k HAVING SUM(i) > 5;
-ERROR:   HAVING clause is not supported on incrementally maintainable materialized view
+ERROR:  HAVING clause is not supported on incrementally maintainable materialized view
 -- contain view or materialized view
 CREATE VIEW b_view AS SELECT i,k FROM mv_base_b;
 CREATE MATERIALIZED VIEW b_mview AS SELECT i,k FROM mv_base_b;

need fix ci.

[hyongtao-db]

 -- contain HAVING
 CREATE INCREMENTAL MATERIALIZED VIEW mv_ivm08 AS SELECT i,j,k FROM mv_base_a a INNER JOIN mv_base_b b USING(i) GROUP BY i,j,k HAVING SUM(i) > 5;
-ERROR:   HAVING clause is not supported on incrementally maintainable materialized view
+ERROR:  HAVING clause is not supported on incrementally maintainable materialized view
 -- contain view or materialized view
 CREATE VIEW b_view AS SELECT i,k FROM mv_base_b;
 CREATE MATERIALIZED VIEW b_mview AS SELECT i,k FROM mv_base_b;

need fix ci.

Thank you. I will do it.