rdoc/stats/normal.rb: clear previous output

* lib/rdoc/stats/normal.rb (print_file): clear previous output
  instead of filling the line, not to leave extra spaces.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46709 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
rdoc/stats/normal.rb: IO.console_size

* lib/rdoc/stats/normal.rb (print_file): use IO.console_size to
  follow window resize.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46710 b2dd03c8-39d4-4d8f-98ff-823fe69b080e