Remove a couple of comments from the pg_lsn regression test.

Previously, one of these was a negative test case, but that got
changed along the way and the comments didn't get the memo.

Michael Paquier

src/test/regress/expected/pg_lsn.out

@@ -52,13 +52,13 @@ SELECT '0/16AE7F8' > pg_lsn '0/16AE7F7';
  t
 (1 row)
 
-SELECT '0/16AE7F7'::pg_lsn - '0/16AE7F8'::pg_lsn; -- No negative results
+SELECT '0/16AE7F7'::pg_lsn - '0/16AE7F8'::pg_lsn;
  ?column? 
 ----------
        -1
 (1 row)
 
-SELECT '0/16AE7F8'::pg_lsn - '0/16AE7F7'::pg_lsn; -- correct
+SELECT '0/16AE7F8'::pg_lsn - '0/16AE7F7'::pg_lsn;
  ?column? 
 ----------
         1

src/test/regress/sql/pg_lsn.sql

@@ -21,5 +21,5 @@ SELECT '0/16AE7F8' = '0/16AE7F8'::pg_lsn;
 SELECT '0/16AE7F8'::pg_lsn != '0/16AE7F7';
 SELECT '0/16AE7F7' < '0/16AE7F8'::pg_lsn;
 SELECT '0/16AE7F8' > pg_lsn '0/16AE7F7';
-SELECT '0/16AE7F7'::pg_lsn - '0/16AE7F8'::pg_lsn; -- No negative results
-SELECT '0/16AE7F8'::pg_lsn - '0/16AE7F7'::pg_lsn; -- correct
+SELECT '0/16AE7F7'::pg_lsn - '0/16AE7F8'::pg_lsn;
+SELECT '0/16AE7F8'::pg_lsn - '0/16AE7F7'::pg_lsn;