Remove unnecessary comment

Co-authored-by: Ifeanyi Ubah <ify1992@yahoo.com>

Author: aharpervc

src/keywords.rs

@@ -1065,7 +1065,6 @@ pub const RESERVED_FOR_TABLE_ALIAS: &[Keyword] = &[
     Keyword::SAMPLE,
     Keyword::TABLESAMPLE,
     Keyword::FROM,
-    // Reserved for SQL Server cursors
     Keyword::OPEN,
 ];