有人可以解释如何在sphinx中使用index指令吗？我仔细阅读了文档，但无法弄清楚如何使用它。似乎没有产生任何输出。我找不到关于.. index::的任何其他解释，基本上是索引页面本身。
例如，我有一个这样的文件：
Gods and Goddesses Review
-------------------------
.. _persephone:
Persephone
==========
- Daughter of Demeter and :ref:`zeus`
- Married Hades, her uncle
- She is the cause of winter
- Representative figure in renaissance artwork
.. _saturn:
.. _cronus:
Saturn/Cronus
=============
- First ruling titan
- Father of :ref:`jupiter`
- Son of Uranus/Caelo and Gaia/Terra
- He Mutilated his father
- Married his sister Rhea/Ops.
- Swallowed all of his children
- Overthrown by Zeus
.. _venus:
.. _aphrodite:
Venus/Aphrodite
===============
- Goddess of love, beauty, pleasure and fertility.
- Symbol: Dove, swan, rose, mirror
- Born from Uranus's chopped off genital
- Is forced to marry Hephaestus/Vulcan
- Has many love affairs with others
.. _mars:
.. _ares:
Mars/Ares
=========
- Son of :ref:`juno` (he has no father)
- God of war and agriculture
- He was caught when he had a affair with Venus
- Symbol: Wolf, woodpecker, spear and shield
.. _juno:
.. _hera:
Juno/Hera
=========
- Goddess of marriage, women, childbirth, family, and stars
- Wife of :ref:`jupiter`
- Daught of :ref:`saturn` and Rhea
- One of the few Olympians to remain loyal to her husband
- Always tries to revenge on her husbands disloyalty to her
.. _neptune:
.. _poseidon:
Neptune/Poseidon
================
- God of ocean
- Weapon: a trident
- Second son of :ref:`saturn` and Rhea
- He was saved by his mother and therefore not devoured by his father
.. _jupiter:
.. _zeus:
Jupiter/Zeus
============
- Married to his sister :ref:`juno`
.. index::
pair: zeus; jupiter
pair: neptune; poseidon
pair: juno; hera
pair: mars; ares
指令.. index::在渲染的html页面上没有产生任何输出。当我进入索引页面时，没有任何链接有效（链接没有指向任何东西。）所以我很困惑何时以及如何使用.. index::指令