Add additional links and index entries for "argument" and "parameter".
This adds to the work done for issue #15990 (i.e. f44b8d69e5fc and the
commits referenced there).
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index 4b62dce..68de3c8 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -600,17 +600,18 @@
expressions.
+.. index::
+ object: callable
+ single: call
+ single: argument; call semantics
+
.. _calls:
Calls
-----
-.. index:: single: call
-
-.. index:: object: callable
-
-A call calls a callable object (e.g., a function) with a possibly empty series
-of arguments:
+A call calls a callable object (e.g., a :term:`function`) with a possibly empty
+series of :term:`arguments <argument>`:
.. productionlist::
call: `primary` "(" [`argument_list` [","] | `comprehension`] ")"
@@ -628,11 +629,14 @@
A trailing comma may be present after the positional and keyword arguments but
does not affect the semantics.
+.. index::
+ single: parameter; call semantics
+
The primary must evaluate to a callable object (user-defined functions, built-in
functions, methods of built-in objects, class objects, methods of class
instances, and all objects having a :meth:`__call__` method are callable). All
argument expressions are evaluated before the call is attempted. Please refer
-to section :ref:`function` for the syntax of formal parameter lists.
+to section :ref:`function` for the syntax of formal :term:`parameter` lists.
.. XXX update with kwonly args PEP