doc: accept a bug report in Japanese on GitHub issue tracker
doc: accept a bug report in Japanese on GitHub issue tracker

[groonga-dev,02651]

Reported by 6elz. Thanks!!!

groonga/groonga,naoa/groonga,groonga/groonga,hiroyuki-sato/groonga,kenhys/groonga,komainu8/groonga,groonga/groonga,naoa/groonga,redfigure/groonga,redfigure/groonga,hiroyuki-sato/groonga,redfigure/groonga,myokoym/groonga,redfigure/groonga,myokoym/groonga,naoa/groonga,komainu8/groonga,groonga/groonga,groonga/groonga,komainu8/groonga,cosmo0920/groonga,kenhys/groonga,hiroyuki-sato/groonga,naoa/groonga,myokoym/groonga,komainu8/groonga,redfigure/groonga,cosmo0920/groonga,hiroyuki-sato/groonga,myokoym/groonga,komainu8/groonga,naoa/groonga,hiroyuki-sato/groonga,naoa/groonga,redfigure/groonga,myokoym/groonga,redfigure/groonga,hiroyuki-sato/groonga,myokoym/groonga,myokoym/groonga,cosmo0920/groonga,cosmo0920/groonga,kenhys/groonga,kenhys/groonga,groonga/groonga,naoa/groonga,cosmo0920/groonga,kenhys/groonga,myokoym/groonga,kenhys/groonga,cosmo0920/groonga,kenhys/groonga,groonga/groonga,cosmo0920/groonga,hiroyuki-sato/groonga,cosmo0920/groonga,komainu8/groonga,groonga/groonga,kenhys/groonga,hiroyuki-sato/groonga,naoa/groonga,redfigure/groonga,komainu8/groonga,komainu8/groonga