[ruby/optparse] Fix link in included file

https://github.com/ruby/optparse/commit/bf03038d95

doc/optparse/creates_option.rdoc

@@ -1,5 +1,5 @@
 Creates an option from the given parameters +params+.
-See {Parameters for New Options}[./option_params_rdoc.html].
+See {Parameters for New Options}[./doc/optparse/option_params_rdoc.html].
 
 The block, if given, is the handler for the created option.
 When the option is encountered during command-line parsing,