Address review: move exceptions to Archiving operations section

- Move ReadError docs near unpack_archive()
- Move RegistryError docs near register_unpack_format()
- Add note that register_unpack_format() raises RegistryError
- Simplify NEWS entry

Author: Chester Li

Doc/library/shutil.rst

@@ -101,21 +101,6 @@ Directory and files operations
 
    .. versionadded:: 3.4
 
-.. exception:: ReadError
-
-   This exception is raised when an archive cannot be read or is not recognized
-   as a supported archive format.  It is raised by :func:`unpack_archive`.
-
-   .. versionadded:: 3.2
-
-.. exception:: RegistryError
-
-   This exception is raised when a registry operation with the archiving
-   and unpacking registries fails, such as registering a duplicate archive
-   format extension.  It is raised by :func:`register_unpack_format`.
-
-   .. versionadded:: 3.2
-
 
 .. function:: copymode(src, dst, *, follow_symlinks=True)
 
@@ -781,6 +766,13 @@ provided.  They rely on the :mod:`zipfile` and :mod:`tarfile` modules.
    .. versionchanged:: 3.12
       Added the *filter* argument.
 
+.. exception:: ReadError
+
+   This exception is raised when an archive cannot be read or is not recognized
+   as a supported archive format.  It is raised by :func:`unpack_archive`.
+
+   .. versionadded:: 3.2
+
 .. function:: register_unpack_format(name, extensions, function[, extra_args[, description]])
 
    Registers an unpack format. *name* is the name of the format and
@@ -800,6 +792,17 @@ provided.  They rely on the :mod:`zipfile` and :mod:`tarfile` modules.
    *description* can be provided to describe the format, and will be returned
    by the :func:`get_unpack_formats` function.
 
+   Raises :exc:`RegistryError` if any of the given *extensions* are already
+   registered for another format.
+
+.. exception:: RegistryError
+
+   This exception is raised when a registry operation with the archiving
+   and unpacking registries fails, such as registering a duplicate archive
+   format extension.  It is raised by :func:`register_unpack_format`.
+
+   .. versionadded:: 3.2
+
 
 .. function:: unregister_unpack_format(name)
 

Misc/NEWS.d/next/Library/2026-04-02-10-05-49.gh-issue-148001.ShutilEx.rst

@@ -1,2 +1 @@
-Add :exc:`shutil.ReadError` and :exc:`shutil.RegistryError` to
-``shutil.__all__`` and document them.
+Publicly expose :exc:`shutil.ReadError` and :exc:`shutil.RegistryError`.