Fix empty strings to empty bytes objects.

diff --cc Doc/library/asynchat.rst
Simple merge

diff --cc Doc/library/asyncore.rst
Simple merge

diff --cc Doc/library/xml.etree.elementtree.rst
index fb6da15a7491678bdf7d5316523616891e235565,3f2dcbb71b4537221fe3565d62542c85a016bbfe..dfa2b71cf5816f455fca9df380fa9f7d48fbbce9
--- 1/Doc/library/xml.etree.elementtree.rst
--- 2/Doc/library/xml.etree.elementtree.rst
+++ b/Doc/library/xml.etree.elementtree.rst
@@@ -508,10 -455,9 +508,10 @@@ Function
     the output encoding (default is US-ASCII).  Use ``encoding="unicode"`` to
     generate a Unicode string (otherwise, a bytestring is generated).  *method*
     is either ``"xml"``, ``"html"`` or ``"text"`` (default is ``"xml"``).
 +   *short_empty_elements* has the same meaning as in :meth:`ElementTree.write`.
     Returns a list of (optionally) encoded strings containing the XML data.
     It does not guarantee any specific sequence, except that
-    ``"".join(tostringlist(element)) == tostring(element)``.
+    ``b"".join(tostringlist(element)) == tostring(element)``.
  
     .. versionadded:: 3.2