Change some rubyforge references.

Author: gkellogg

lib/rdf/model/uri.rb

@@ -23,7 +23,7 @@ module RDF
   # @see http://en.wikipedia.org/wiki/Uniform_Resource_Identifier
   # @see http://www.ietf.org/rfc/rfc3986.txt
   # @see http://www.ietf.org/rfc/rfc3987.txt
-  # @see http://addressable.rubyforge.org/
+  # @see http://www.rubydoc.info/gems/addressable
   class URI
     include RDF::Resource
 

lib/rdf/ntriples.rb

@@ -13,7 +13,7 @@ module RDF
   #
   # An example of an RDF statement in N-Triples format:
   #
-  #     <http://rubyforge.org/> <http://purl.org/dc/terms/title> "RubyForge" .
+  #     <http://rubygems.org/gems/rdf> <http://purl.org/dc/terms/title> "rdf" .
   #
   # Installation
   # ------------

lib/rdf/util/cache.rb

@@ -9,8 +9,8 @@ module RDF; module Util
   #
   # While this cache is something of an internal implementation detail of
   # RDF.rb, some external libraries do currently make use of it as well,
-  # including [SPARQL](http://ruby-rdf/sparql/) and
-  # [Spira](http://spira.rubyforge.org/). Do be sure to include any changes
+  # including [SPARQL](http://github.com/ruby-rdf/sparql/) and
+  # [Spira](http://github.com/ruby-rdf/spira). Do be sure to include any changes
   # here in the RDF.rb changelog.
   #
   # @see   RDF::URI.intern