+ adjust formatting

Author: skirpichev

peps/pep-0757.rst

@@ -154,9 +154,9 @@ If :c:member:`PyLongExport.digits` is not ``NULL``, a private field of the
    :c:func:`PyLong_FreeExport` must be called when the export is no longer
    needed.
 
-    .. impl-detail::
-        This function always succeeds if *obj* is a Python :class:`int` object
-        or a subclass.
+   .. impl-detail::
+      This function always succeeds if *obj* is a Python :class:`int` object
+      or a subclass.
 
 
 On CPython 3.14, no memory copy is needed in :c:func:`PyLong_Export`, it's just