[quic] [stats] fix typo in include/h2o.h
[quic] [stats] fix typo in include/h2o.h

cwyang/h2o,cwyang/h2o,yannick/h2o,devnexen/h2o,h2o/h2o,devnexen/h2o,h2o/h2o,h2o/h2o,devnexen/h2o,yannick/h2o,devnexen/h2o,yannick/h2o,cwyang/h2o,h2o/h2o,yannick/h2o,cwyang/h2o,yannick/h2o,h2o/h2o,cwyang/h2o,cwyang/h2o,yannick/h2o,cwyang/h2o,devnexen/h2o,cwyang/h2o,h2o/h2o,h2o/h2o,devnexen/h2o,devnexen/h2o,yannick/h2o,h2o/h2o,h2o/h2o,devnexen/h2o,yannick/h2o,devnexen/h2o,yannick/h2o