gh-69619: Clarify "whitespace" in the str.{l,r}strip() documentation (#150901)

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

Author: kyo5uke

Doc/library/stdtypes.rst

@@ -2376,7 +2376,8 @@ expression support in the :mod:`re` module).
 
    Return a copy of the string with leading characters removed.  The *chars*
    argument is a string specifying the set of characters to be removed.  If omitted
-   or ``None``, the *chars* argument defaults to removing whitespace.  The *chars*
+   or ``None``, the *chars* argument defaults to removing whitespace, that is
+   characters for which :meth:`str.isspace` is true.  The *chars*
    argument is not a prefix; rather, all combinations of its values are stripped::
 
       >>> '   spacious   '.lstrip()
@@ -2579,7 +2580,8 @@ expression support in the :mod:`re` module).
 
    Return a copy of the string with trailing characters removed.  The *chars*
    argument is a string specifying the set of characters to be removed.  If omitted
-   or ``None``, the *chars* argument defaults to removing whitespace.  The *chars*
+   or ``None``, the *chars* argument defaults to removing whitespace, that is
+   characters for which :meth:`str.isspace` is true.  The *chars*
    argument is not a suffix; rather, all combinations of its values are stripped.
    For example:
 
@@ -2755,11 +2757,9 @@ expression support in the :mod:`re` module).
 
    Return a copy of the string with the leading and trailing characters removed.
    The *chars* argument is a string specifying the set of characters to be removed.
-   If omitted or ``None``, the *chars* argument defaults to removing whitespace.
-   The *chars* argument is not a prefix or suffix; rather, all combinations of its
-   values are stripped.
-
-   Whitespace characters are defined by :meth:`str.isspace`.
+   If omitted or ``None``, the *chars* argument defaults to removing whitespace,
+   that is characters for which :meth:`str.isspace` is true.  The *chars* argument
+   is not a prefix or suffix; rather, all combinations of its values are stripped.
 
    For example: