Apply suggestions from code review

Co-authored-by: Brian Schubert <brianm.schubert@gmail.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

Author: 3 people

Doc/library/traceback.rst

@@ -63,7 +63,7 @@ Module-Level Functions
    :term:`file <file object>` or :term:`file-like object` to
    receive the output.
 
-   If *show_lines* is false, source code lines are not included in the output.
+   If *show_lines* is true (the default), source code lines will be included in the output.
 
    If *recent_first* is true, the most recent stack trace entries are printed
    first, otherwise the oldest entries are printed first. The default is false.
@@ -121,7 +121,7 @@ Module-Level Functions
    printed as well, like the interpreter itself does when printing an unhandled
    exception.
 
-   If *show_lines* is false, source code lines are not included in the output.
+   If *show_lines* is true, source code lines are included in the output.
 
    If *recent_first* is true, the most recent stack trace entries are printed
    first, otherwise the oldest entries are printed first. The default is false.
@@ -165,8 +165,8 @@ Module-Level Functions
    The optional *f* argument can be used to specify an alternate
    :ref:`stack frame <frame-objects>`
    to start.  The optional *file* argument has the same meaning as for
-   :func:`print_tb`.  If *show_lines* is ``False``, source code lines are
-   not included in the output.
+   :func:`print_tb`.  If *show_lines* is true, source code lines are
+   included in the output.
 
    .. versionchanged:: 3.5
       Added negative *limit* support.
@@ -201,7 +201,7 @@ Module-Level Functions
    Print the list of tuples as returned by :func:`extract_tb` or
    :func:`extract_stack` as a formatted stack trace to the given file.
    If *file* is ``None``, the output is written to :data:`sys.stderr`.
-   If *show_lines* is ``False``, source code lines are not included in the output.
+   If *show_lines* is true, source code lines are included in the output.
 
    .. versionchanged:: next
       Added *show_lines* parameter.
@@ -214,8 +214,8 @@ Module-Level Functions
    for printing.  Each string in the resulting list corresponds to the item with
    the same index in the argument list.  Each string ends in a newline; the
    strings may contain internal newlines as well, for those items whose source
-   text line is not ``None``.  If *show_lines* is ``False``, source code lines
-   are not included in the output.
+   text line is not ``None``.  If *show_lines* is ``True``, source code lines
+   are included in the output.
 
    .. versionchanged:: next
       Added *show_lines* parameter.
@@ -259,7 +259,7 @@ Module-Level Functions
    containing internal newlines.  When these lines are concatenated and printed,
    exactly the same text is printed as does :func:`print_exception`.
 
-   If *show_lines* is false, source code lines are not included in the output.
+   If *show_lines* is true, source code lines are included in the output.
    If *recent_first* is true, the most recent stack trace entries are printed
    first, otherwise the oldest entries are printed first. The default is false.
 
@@ -279,7 +279,7 @@ Module-Level Functions
    This is like ``print_exc(limit)`` but returns a string instead of printing to
    a file.
 
-   If *show_lines* is false, source code lines are not included in the output.
+   If *show_lines* is true, source code lines are included in the output.
    If *recent_first* is true, the most recent stack trace entries are printed
    first, otherwise the oldest entries are printed first. The default is false.
 
@@ -478,7 +478,7 @@ the module-level functions described above.
       Print to *file* (default ``sys.stderr``) the exception information returned by
       :meth:`format`.
 
-      If *show_lines* is false, source code lines from being included in the output.
+      If *show_lines* is true, source code lines are included in the output.
 
       If *recent_first* is true, the exception is printed first followed by stack
       trace by "most recent call first" order.
@@ -501,7 +501,7 @@ the module-level functions described above.
       some containing internal newlines. :func:`~traceback.print_exception`
       is a wrapper around this method which just prints the lines to a file.
 
-      If *show_lines* is false, source code lines from being included in the output.
+      If *show_lines* is true, source code lines are included in the output.
 
       If *recent_first* is true, the exception is printed first followed by stack
       trace by "most recent call first" order.
@@ -585,8 +585,7 @@ the module-level functions described above.
       repetitions are shown, followed by a summary line stating the exact
       number of further repetitions.
 
-      The keyword argument *show_lines*, if ``False``, prevents source code
-      lines from being included in the output.
+      If *show_lines* is true, includes source code lines in the output.
 
       .. versionchanged:: 3.6
          Long sequences of repeated frames are now abbreviated.
@@ -602,8 +601,8 @@ the module-level functions described above.
       printed by :meth:`StackSummary.format`. If it returns ``None``, the
       frame is omitted from the output.
 
-      The keyword argument *show_lines*, if ``False``, prevents source code
-      lines from being included in the output.
+      The keyword argument *show_lines*, if ``True``, includes source code
+      lines in the output.
 
       .. versionadded:: 3.11
 

Doc/whatsnew/3.15.rst

@@ -174,13 +174,13 @@ tarfile
 traceback
 ----------
 
-* Add new ``show_lines`` and ``recent_first`` keyword only arguments to
+* Add new *show_lines* and *recent_first* keyword only arguments to
   the :mod:`traceback` functions.
 
-  The ``show_lines`` argument controls whether source code lines are displayed.
+  The *show_lines* argument controls whether source code lines are displayed.
   It is default to ``True``.
 
-  The ``recent_first`` argument controls whether the most recent frames are
+  The *recent_first* argument controls whether the most recent frames are
   displayed first or last in the traceback. It affects whether the exception
   is displayed at the top or bottom of the traceback. It is default to ``False``.
   (Contributed by Inada Naoki in :gh:`135751`)