Factor in documentation changes from issue 1753732.

Doc/library/xmlrpclib.rst

@@ -121,6 +121,14 @@ between conformable Python objects and XML on the wire.
    `XML-RPC Introspection <http://xmlrpc-c.sourceforge.net/introspection.html>`_
       Describes the XML-RPC protocol extension for introspection.
 
+   `XML-RPC Specification <http://www.xmlrpc.com/spec>`_
+      The official specification.
+
+   `Unofficial XML-RPC Errata <http://effbot.org/zone/xmlrpc-errata.htm>`_
+      Fredrik Lundh's "unofficial errata, intended to clarify certain
+      details in the XML-RPC specification, as well as hint at
+      'best practices' to use when designing your own XML-RPC
+      implementations."
 
 .. _serverproxy-objects:
 
@@ -290,6 +298,11 @@ internal use by the marshalling/unmarshalling code:
 
    Write the XML-RPC base 64 encoding of this binary item to the out stream object.
 
+   The encoded data will have newlines every 76 characters as per
+   `RFC 2045 section 6.8 <http://tools.ietf.org/html/rfc2045#section-6.8>`_,
+   which was the de facto standard base64 specification when the
+   XML-RPC spec was written.
+
 It also supports certain of Python's built-in operators through a
 :meth:`__cmp__` method.