typedef struct WindowClause misleading comments

[jian he]

Hi.

Query jumbling considers the ORDER BY clause; therefore, the comment
below is inaccurate.

/
 * The information relevant for the query jumbling is the partition clause
 * type and its bounds.
 */
typedef struct WindowClause
{
    NodeTag        type;
    /* window name (NULL in an OVER clause) */
    char       *name pg_node_attr(query_jumble_ignore);
    /* referenced window name, if any */
    char       *refname pg_node_attr(query_jumble_ignore);
    List       *partitionClause;    /* PARTITION BY list */
    /* ORDER BY list */
    List       *orderClause;
    int            frameOptions;    /* frame_clause options, see WindowDef */
    Node       *startOffset;    /* expression for starting bound, if any */
    Node       *endOffset;        /* expression for ending bound, if any */
   .....
}