Update usage.rst

**hypopg_list_indexes()** should be called with '()', such as 'select * from hypopg_list_indexes();'.
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@ -176,12 +176,12 @@ Manipulate hypothetical indexes
Some other convenience functions and views are available:
- **hypopg_list_indexes**: view that lists all hypothetical indexes that have
- **hypopg_list_indexes()**: view that lists all hypothetical indexes that have
been created
.. code-block:: psql
SELECT * FROM hypopg_list_indexes ;
SELECT * FROM hypopg_list_indexes() ;
indexrelid | indexname | nspname | relname | amname
------------+----------------------+---------+---------+--------
18284 | <18284>btree_hypo_id | public | hypo | btree