Apply suggestions from code review

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Author: serhiy-storchaka

Doc/c-api/veryhigh.rst

@@ -267,7 +267,7 @@ the same library that the Python runtime is using.
    evaluation.  This environment consists of a dictionary of global variables,
    a mapping object of local variables, arrays of arguments, keywords and
    defaults, a dictionary of default values for :ref:`keyword-only
-   <keyword-only_parameter>` parameters and a closure tuple of cells.
+   <keyword-only_parameter>` parameters, and a closure tuple of cells.
 
 
 .. c:function:: PyObject* PyEval_EvalFrame(PyFrameObject *f)

Doc/library/ast.rst

@@ -1930,16 +1930,16 @@ Function and class definitions
 
 .. class:: arguments(posonlyargs, args, vararg, kwonlyargs, kw_defaults, kwarg, defaults)
 
-   The parameters for a function.
+   The parameters for the defined function.
 
    * ``posonlyargs``, ``args`` and ``kwonlyargs`` are lists of :class:`arg` nodes.
    * ``vararg`` and ``kwarg`` are single :class:`arg` nodes, referring to the
      ``*args, **kwargs`` parameters.
-   * ``kw_defaults`` is a list of default values for keyword-only parameters. If
+   * ``kw_defaults`` is the list of default values for keyword-only parameters. If
      one is ``None``, the corresponding argument is required.
-   * ``defaults`` is a list of default values for positional-only and
+   * ``defaults`` is the list of default values for positional-only and
      keyword-or-positional parameters.
-     If there are fewer defaults, they correspond to the last *n*
+     If there are fewer defaults than there are such parameters, the defaults correspond to the last *n*
      parameters.