Merge pull request ruby#373 from bitfurry/master

Updated link to rake RDoc::Task.

Author: hsbt

README.rdoc

@@ -46,7 +46,7 @@ contain just Markup-style markup (with or without leading '#' comment
 markers).  If directory names are passed to RDoc, they are scanned
 recursively for C and Ruby source files only.
 
-To generate documentation using +rake+ see RDoc::Task.
+To generate documentation using +rake+ see RDoc::Task[http://docs.seattlerb.org/rdoc/RDocTask.html].
 
 To generate documentation programmatically: