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 e5955bf..812fb70 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -667,17 +667,18 @@
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` [","]
@@ -696,12 +697,15 @@
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 certain class instances themselves are callable; extensions may
define additional callable object types). All argument expressions are
evaluated before the call is attempted. Please refer to section :ref:`function`
-for the syntax of formal parameter lists.
+for the syntax of formal :term:`parameter` lists.
If keyword arguments are present, they are first converted to positional
arguments, as follows. First, a list of unfilled slots is created for the