Fix typo in core/exception/full_message_spec.rb
Fix typo in core/exception/full_message_spec.rb

nobu/rubyspec,eregon/rubyspec,ruby/spec,ruby/rubyspec,ruby/spec,nobu/rubyspec,eregon/rubyspec,nobu/rubyspec,ruby/spec,eregon/rubyspec,ruby/rubyspec