Fixing comments to use "#" instead of "--"

mysql-test/t/ctype_uca.test

@@ -530,7 +530,7 @@ create table t1 (
   a varchar(255),
   key a(a)
 ) character set utf8 collate utf8_czech_ci;
--- In Czech 'ch' is a single letter between 'h' and 'i'
+# In Czech 'ch' is a single letter between 'h' and 'i'
 insert into t1 values
 ('b'),('c'),('d'),('e'),('f'),('g'),('h'),('ch'),('i'),('j');
 select * from t1 where a like 'c%';

mysql-test/t/subselect.test

@@ -2970,7 +2970,7 @@ DROP TABLE t1,t2;
 CREATE TABLE t1 (a INT, b INT);
 INSERT INTO t1 VALUES (1, 2), (1,3), (1,4), (2,1), (2,2);
 
--- returns no rows, when it should
+# returns no rows, when it should
 SELECT a1.a, COUNT(*) FROM t1 a1 WHERE a1.a = 1
 AND EXISTS( SELECT a2.a FROM t1 a2 WHERE a2.a = a1.a)
 GROUP BY a1.a;