fix: don't remove SQL hints from queries

[cofin]

This small PR adjusts the regular expression for multiline comments. Previously, it was incorrectly flagging the SQL Hint syntax as a multi-line comment.

Here is an example a valid hint:

select /*+ parallel(a) */ 
from big_table a
where a.foo = :foo 

[zx80]

Accepted after a fix, see #190.