[3.13] gh-128481: indicate that the default value for `FrameSummary.end_lineno` chang...

[3.13] gh-128481: indicate that the default value for `FrameSummary.end_lineno` changed in 3.13 (GH-130755) (#130767)

gh-128481: indicate that the default value for `FrameSummary.end_lineno` changed in 3.13 (GH-130755)

The value taken by `FrameSummary.end_lineno` when passing `end_lineno=None` changed in gh-112097.

Previously, a `end_lineno` could be specified to be `None` directly but since 939fc6d, passing None makes
the constructor use the value of `lineno` instead.
(cherry picked from commit c6513f7a627c8918a5e3f3733fa47d34a94ddff9)

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