class documentation

Node for index entries. This node is created by the ``index`` directive and has one attribute, ``entries``. Its value is a list of 5-tuples of ``(entrytype, entryname, target, ignored, key)``. *entrytype* is one of "single", "pair", "double", "triple". *key* is categorization characters (usually a single character) for general index page. For the details of this, please see also: :rst:dir:`glossary` and issue #2320.