eh, maybe this will be better?

peps/pep-0757.rst

@@ -154,11 +154,8 @@ 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.
 
-   .. admonition:: CPython implementation detail
-      :class: warning
-
-      This function always succeeds if *obj* is a Python :class:`int` object
-      or a subclass.
+   *CPython implementation 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
@@ -169,11 +166,8 @@ a thin wrapper to expose Python :class:`int` internal digits array.
 
    Release the export *export_long* created by :c:func:`PyLong_Export`.
 
-   .. admonition:: CPython implementation detail
-      :class: warning
-
-      Calling :c:func:`PyLong_FreeExport` is optional if *export_long->digits*
-      is ``NULL``.
+   *CPython implementation detail*: Calling :c:func:`PyLong_FreeExport` is
+   optional if *export_long->digits* is ``NULL``.
 
 
 Import API