Fix outdated javadoc comment
Fix outdated javadoc comment

The constant was renamed some time ago.

vnnv/nanohttpd_vnnv,codebeautiful/nanohttpd,WilliamDo/nanohttpd,harshjv/nanohttpd,anandsadu/nanohttpd,songfj/nanohttpd,LordFokas/nanohttpd,ouya/nanohttpd,huanyi0723/nanohttpd,panxw/nanohttpd,gushedaoren/nanohttpd,DavikChen/nanohttpd,huanyi0723/nanohttpd,NanoHttpd/nanohttpd,McFoggy/nanohttpd,eGxC/nanohttpd,andreivisan/nanohttpd,harshjv/nanohttpd,updowndown/nanohttpd,eGxC/nanohttpd,WilliamDo/nanohttpd,guardianproject/nanohttpd,weathersboyle/nanohttpd,DavikChen/nanohttpd,EricCen/nanohttpd,kayhanakbay/nanohttpd,songfj/nanohttpd,biswajitind/SCMF,andreivisan/nanohttpd,NanoHttpd/nanohttpd,biswajitind/SCMF,kayhanakbay/nanohttpd,weathersboyle/nanohttpd,gushedaoren/nanohttpd,guardianproject/nanohttpd,eighthave/nanohttpd,ouya/nanohttpd,QumuloMe/nanohttpd,McFoggy/nanohttpd,panxw/nanohttpd,EricCen/nanohttpd,updowndown/nanohttpd,vnnv/nanohttpd_vnnv,eighthave/nanohttpd,codebeautiful/nanohttpd,ma5069073/nanohttpd,ma5069073/nanohttpd,anandsadu/nanohttpd,LordFokas/nanohttpd,QumuloMe/nanohttpd