[ruby/reline] Add doc about ed-kill-line, kill-line, em-kill-line, and unix-line-discard
https://github.com/ruby/reline/commit/586a48ffe0
[ruby/reline] Add doc about ed-kill-line, kill-line, em-kill-line, and unix-line-discard
https://github.com/ruby/reline/commit/586a48ffe0