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).

1 files changed, 11 insertions, 7 deletions

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 @@ upper bound and stride, respectively, substituting ``None`` for missing
 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 @@ of arguments:
 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