Change security warning to note about intended usage

Author: sethmlarson

Doc/library/xml.sax.utils.rst

@@ -71,12 +71,10 @@ or as base classes.
    content:  if ``False`` (the default) they are emitted as a pair of start/end
    tags, if set to ``True`` they are emitted as a single self-closed tag.
 
-   .. warning::
-      :class:`!XMLGenerator` does not validate element or
-      attribute names. Callers must ensure that names passed to APIs conform
-      to `XML name rules <https://www.w3.org/TR/xml/#NT-Name>`__ if passing
-      untrusted input. Character data and attribute values are escaped,
-      but not validated.
+   .. note::
+      :class:`!XMLGenerator` is only intended to be used as a ``handler``
+      with SAX parser functions from the :mod:`!xml.sax` module. Using XMLGenerator
+      on untrusted user inputs is not the intended use.
 
    .. versionchanged:: 3.2
       Added the *short_empty_elements* parameter.