gh-93738: Documentation C syntax (:c:type:PyBytesObject* -> :c:expr…

…:`PyBytesObject*`) (#97782)

:c:type:`PyBytesObject*` -> :c:expr:`PyBytesObject*`

Doc/c-api/unicode.rst

@@ -711,7 +711,7 @@ conversion function:
    ParseTuple converter: encode :class:`str` objects -- obtained directly or
    through the :class:`os.PathLike` interface -- to :class:`bytes` using
    :c:func:`PyUnicode_EncodeFSDefault`; :class:`bytes` objects are output as-is.
-   *result* must be a :c:type:`PyBytesObject*` which must be released when it is
+   *result* must be a :c:expr:`PyBytesObject*` which must be released when it is
    no longer used.
 
    .. versionadded:: 3.1