Ruby

tool: add descriptions and fix typos

• tool/asm_parse.rb: add description
• tool/change_maker.rb: ditto
• tool/downloader.rb: ditto
• tool/eval.rb: ditto
• tool/expand-config.rb: ditto
• tool/extlibs.rb: ditto
• tool/fake.rb: ditto
• tool/file2lastrev.rb: ditto
• tool/gem-unpack.rb: ditto
• tool/gen_dummy_probes.rb: ditto
• tool/gen_ruby_tapset.rb: ditto
• tool/generic_erb.rb: ditto
• tool/id2token.rb: ditto
• tool/ifchange: ditto
• tool/insns2vm.rb: ditto
• tool/instruction.rb: ditto
• tool/jisx0208.rb: ditto
• tool/merger.rb: ditto
• tool/mkrunnable.rb: ditto
• tool/node_name.rb: ditto
• tool/parse.rb: ditto
• tool/rbinstall.rb: ditto
• tool/rbuninstall.rb: ditto
• tool/rmdirs: ditto
• tool/runruby.rb: ditto
• tool/strip-rdoc.rb: ditto
• tool/vcs.rb: ditto
• tool/vtlh.rb: ditto
• tool/ytab.sed: ditto
• tool/enc-unicode.rb: fix typo
• tool/mk_call_iseq_optimized.rb: ditto
• tool/update-deps: ditto
  [ruby-core:76215] [Bug #12539]
  by Noah Gibbs [email protected]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55564 b2dd03c8-39d4-4d8f-98ff-823fe69b080e