Fix MDB_GET_MULTIPLE/MDB_NEXT_MULTIPLE doc.

libraries/liblmdb/lmdb.h

@@ -345,16 +345,18 @@ typedef enum MDB_cursor_op {
 	MDB_GET_BOTH,			/**< Position at key/data pair. Only for #MDB_DUPSORT */
 	MDB_GET_BOTH_RANGE,		/**< position at key, nearest data. Only for #MDB_DUPSORT */
 	MDB_GET_CURRENT,		/**< Return key/data at current cursor position */
-	MDB_GET_MULTIPLE,		/**< Return all the duplicate data items at the current
+	MDB_GET_MULTIPLE,		/**< Return key and up to a page of duplicate data items
-								 cursor position. Only for #MDB_DUPFIXED */
+								from current cursor position. Move cursor to prepare
+								for #MDB_NEXT_MULTIPLE. Only for #MDB_DUPFIXED */
 	MDB_LAST,				/**< Position at last key/data item */
 	MDB_LAST_DUP,			/**< Position at last data item of current key.
 								Only for #MDB_DUPSORT */
 	MDB_NEXT,				/**< Position at next data item */
 	MDB_NEXT_DUP,			/**< Position at next data item of current key.
 								Only for #MDB_DUPSORT */
-	MDB_NEXT_MULTIPLE,		/**< Return all duplicate data items at the next
+	MDB_NEXT_MULTIPLE,		/**< Return key and up to a page of duplicate data items
-								cursor position. Only for #MDB_DUPFIXED */
+								from next cursor position. Move cursor to prepare
+								for #MDB_NEXT_MULTIPLE. Only for #MDB_DUPFIXED */
 	MDB_NEXT_NODUP,			/**< Position at first data item of next key */
 	MDB_PREV,				/**< Position at previous data item */
 	MDB_PREV_DUP,			/**< Position at previous data item of current key.