Replace "Caveat" paragraphs by .. warning::s.
diff --git a/Doc/library/shutil.rst b/Doc/library/shutil.rst
index 7ed70af..8cc27d4 100644
--- a/Doc/library/shutil.rst
+++ b/Doc/library/shutil.rst
@@ -17,9 +17,11 @@
collections of files. In particular, functions are provided which support file
copying and removal.
-**Caveat:** On MacOS, the resource fork and other metadata are not used. For
-file copies, this means that resources will be lost and file type and creator
-codes will not be correct.
+.. warning::
+
+ On MacOS, the resource fork and other metadata are not used. For file copies,
+ this means that resources will be lost and file type and creator codes will
+ not be correct.
.. function:: copyfile(src, dst)