Document InvalidWheelFilename and InvalidSdistFilename

Also applied suggestions from code review

Co-authored-by: Brett Cannon <brett@python.org>

docs/utils.rst

@@ -63,7 +63,7 @@ Reference
     instance of :class:`~packaging.tags.Tag`.
 
     :param str filename: The name of the wheel file.
-    :raises packaging.utils.InvalidWheelFilename: If the filename in question
+    :raises InvalidWheelFilename: If the filename in question
         does not follow conventions outlined in `PEP 427`_.
 
     .. doctest::
@@ -89,7 +89,7 @@ Reference
     represented by an instance of :class:`~packaging.version.Version`.
 
     :param str filename: The name of the sdist file.
-    :raises packaging.utils.InvalidSdistFilename: If the filename does not end
+    :raises InvalidSdistFilename: If the filename does not end
         with an sdist extension (``.zip`` or ``.tar.gz``), or if it does not
         contain a dash separating the name and the version of the distribution.
 
@@ -103,5 +103,14 @@ Reference
         >>> ver == Version('1.0')
         True
 
+
+.. exception:: InvalidWheelFilename
+
+    Raised when a file name for a wheel is invalid.
+
+.. exception:: InvalidSdistFilename
+
+    Raised a source distribution file name is considered invalid.
+
 .. _Source distribution format: https://packaging.python.org/specifications/source-distribution-format/#source-distribution-file-name
 .. _`PEP 427`: https://peps.python.org/pep-0427/#file-name-convention