[3.11] gh-93738: Documentation C syntax (:c:type:`PyBytesObject*` -> :c:expr:`PyBytesObject*`) (GH-97782) (#97861)

:c:type:`PyBytesObject*` -> :c:expr:`PyBytesObject*`
(cherry picked from commit 9ebc50866b58a0ee2985c6540a67fee8a4a49e4d)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>