bpo-33859: Fix spelling mistakes in docs. (GH-7691)

(cherry picked from commit c151f7846d6d900c22edaaa77f5f7771b529099e)

Co-authored-by: Xtreak <tirkarthi@users.noreply.github.com>
diff --git a/Doc/library/xmlrpc.client.rst b/Doc/library/xmlrpc.client.rst
index ed2ccae..27d92e3 100644
--- a/Doc/library/xmlrpc.client.rst
+++ b/Doc/library/xmlrpc.client.rst
@@ -145,7 +145,7 @@
 
    .. versionchanged:: 3.6
       Added support of type tags with prefixes (e.g. ``ex:nil``).
-      Added support of unmarsalling additional types used by Apache XML-RPC
+      Added support of unmarshalling additional types used by Apache XML-RPC
       implementation for numerics: ``i1``, ``i2``, ``i8``, ``biginteger``,
       ``float`` and ``bigdecimal``.
       See http://ws.apache.org/xmlrpc/types.html for a description.