[ruby/irb] Deprecate multi-irb commands (https://github.com/ruby/irb/pull/654)
Multi-irb
https://github.com/ruby/irb/commit/861731ac12
[ruby/irb] Deprecate multi-irb commands
(https://github.com/ruby/irb/pull/654)
Multi-irbcategory with a deprecatedlabel
https://github.com/ruby/irb/commit/861731ac12