clarified update instructions in README.rdoc

[git-p4: depot-paths = "//src/ruby_parser/dev/": change = 13655]

Author: zenspider

README.rdoc

@@ -68,8 +68,9 @@ To add a new version:
 * New parser should be generated from lib/ruby[3]_parser.yy.
 * Extend lib/ruby[3]_parser.yy with new class name.
 * Add new version number to V2/V3 in Rakefile for rule creation.
-* Add new (full) version to `ruby_parse` section of Rakefile for rake compare
+* Add new `ruby_parse "x.y.z"` line to Rakefile for rake compare (line ~300).
 * Require generated parser in lib/ruby_parser.rb.
+* Add new V## = ::Ruby##Parser; end to ruby_parser.rb (bottom of file).
 * Add empty TestRubyParserShared##Plus module and TestRubyParserV## to test/test_ruby_parser.rb.
 * Extend Manifest.txt with generated file names.
 * Add new version number to sexp_processor's pt_testcase.rb in all_versions