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, 10 insertions, 4 deletions

diff --git a/Doc/reference/compound_stmts.rst b/Doc/reference/compound_stmts.rst
index 6889176..d0d0646 100644
--- a/Doc/reference/compound_stmts.rst
+++ b/Doc/reference/compound_stmts.rst
@@ -417,6 +417,9 @@ is equivalent to ::
       statement.
 
 
+.. index::
+   single: parameter; function definition
+
 .. _function:
 .. _def:
 
@@ -478,11 +481,14 @@ is equivalent to ::
    def func(): pass
    func = f1(arg)(f2(func))
 
-.. index:: triple: default; parameter; value
+.. index::
+   triple: default; parameter; value
+   single: argument; function definition
 
-When one or more parameters have the form *parameter* ``=`` *expression*, the
-function is said to have "default parameter values."  For a parameter with a
-default value, the corresponding argument may be omitted from a call, in which
+When one or more :term:`parameters <parameter>` have the form *parameter* ``=``
+*expression*, the function is said to have "default parameter values."  For a
+parameter with a default value, the corresponding :term:`argument` may be
+omitted from a call, in which
 case the parameter's default value is substituted.  If a parameter has a default
 value, all following parameters up until the "``*``" must also have a default
 value --- this is a syntactic restriction that is not expressed by the grammar.