gh-114364: Fix awkward wording about mmap.mmap.seekable (#114374)

---------
Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>

Author: 4 people

Doc/whatsnew/3.13.rst

@@ -259,8 +259,8 @@ mmap
 ----
 
 * The :class:`mmap.mmap` class now has an :meth:`~mmap.mmap.seekable` method
-  that can be used where it requires a file-like object with seekable and
-  the :meth:`~mmap.mmap.seek` method return the new absolute position.
+  that can be used when a seekable file-like object is required.
+  The :meth:`~mmap.mmap.seek` method now returns the new absolute position.
   (Contributed by Donghee Na and Sylvie Liberman in :gh:`111835`.)
 * :class:`mmap.mmap` now has a *trackfd* parameter on Unix; if it is ``False``,
   the file descriptor specified by *fileno* will not be duplicated.

Misc/NEWS.d/3.13.0a2.rst

@@ -565,9 +565,9 @@ part of a :exc:`BaseExceptionGroup`, in addition to the recent support for
 .. section: Library
 
 The :class:`mmap.mmap` class now has an :meth:`~mmap.mmap.seekable` method
-that can be used where it requires a file-like object with seekable and the
-:meth:`~mmap.mmap.seek` method return the new absolute position. Patch by
-Donghee Na.
+that can be used when a seekable file-like object is required.
+The :meth:`~mmap.mmap.seek` method now returns the new absolute position.
+Patch by Donghee Na.
 
 ..