Document default value of chunkHighMark.
Document default value of chunkHighMark.

darcs-hash:20071001020606-4cc09-9d731b4b187c0a168bc93b21434a7dc0c47e1425.gz

berkley4/polipo,jeromelebel/polipo,berkley4/polipo,dxq-git/polipo,ssb22/polipo2,fqtools/polipo,fqtools/polipo,Android-Apps/polipo,fqtools/polipo,Psiphon-Inc/polipo,lkraider/polipo,gorakhargosh/polipo,clowwindy/polipo,jech/polipo,galeksandrp/polipo,danchr/polipo,fukusaka/polipo,akkakks/polipo,ssb22/polipo2,ssb22/polipo2,galeksandrp/polipo,jech/polipo,akkakks/polipo,feijilei/polipo,TierraDelFuego/opilop,akkakks/polipo,dxq-git/polipo,toke/polipo,strongwillow/polipo,nxtreaming/chumen,feijilei/polipo,lkraider/polipo,strongwillow/polipo,caeies/polipo-caeies,nxtreaming/chumen,lkraider/polipo,galeksandrp/polipo,doublec/namecoin-polipo,jech/polipo,nxtreaming/chumen,Android-Apps/polipo,berkley4/polipo,ajmgh/polipo,feijilei/polipo,dxq-git/polipo