lib/shell/command-processor.rb: translate Japanese comments into
English.

* doc/shell.rd.jp: RD'ify and make some fixes.

* doc/shell.rd: RD'ify, delete Japanese leftovers, make overall
English fixes, and sync with doc/shell.rd.jp.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_6@1427 b2dd03c8-39d4-4d8f-98ff-823fe69b080e