* lib/xmlrpc/httpserver.rb: [DOC] Fix typo

s/authentification/authentication/
[ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44091 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/xmlrpc/httpserver.rb

@@ -134,7 +134,7 @@ private
   # If an Exception is raised while handling the request, the client will receive
   # a 500 "Internal Server Error" message.
   def serve(io) # :doc:
-    # perform IP authentification
+    # perform IP authentication
     unless @handler.ip_auth_handler(io)
       io << http_resp(403, "Forbidden")
       return