[doc / util] Use comments to clarify time unit for int64_t type.
[doc / util] Use comments to clarify time unit for int64_t type.

MarcoFalke/bitcoin,namecoin/namecore,fanquake/bitcoin,domob1812/namecore,Sjors/bitcoin,achow101/bitcoin,Xekyo/bitcoin,tecnovert/particl-core,Sjors/bitcoin,tecnovert/particl-core,achow101/bitcoin,dscotese/bitcoin,kallewoof/bitcoin,tecnovert/particl-core,anditto/bitcoin,Xekyo/bitcoin,jamesob/bitcoin,qtumproject/qtum,bitcoinknots/bitcoin,bitcoinsSG/bitcoin,fanquake/bitcoin,mruddy/bitcoin,bitcoinsSG/bitcoin,qtumproject/qtum,JeremyRubin/bitcoin,mruddy/bitcoin,MeshCollider/bitcoin,mruddy/bitcoin,andreaskern/bitcoin,MarcoFalke/bitcoin,GroestlCoin/GroestlCoin,rnicoll/bitcoin,ElementsProject/elements,GroestlCoin/bitcoin,pataquets/namecoin-core,mm-s/bitcoin,domob1812/bitcoin,anditto/bitcoin,jamesob/bitcoin,bitcoinknots/bitcoin,rnicoll/bitcoin,fujicoin/fujicoin,jambolo/bitcoin,AkioNak/bitcoin,jlopp/statoshi,AkioNak/bitcoin,yenliangl/bitcoin,dscotese/bitcoin,achow101/bitcoin,AkioNak/bitcoin,yenliangl/bitcoin,ajtowns/bitcoin,n1bor/bitcoin,bitcoin/bitcoin,namecoin/namecore,anditto/bitcoin,jamesob/bitcoin,yenliangl/bitcoin,JeremyRubin/bitcoin,mm-s/bitcoin,sstone/bitcoin,kallewoof/bitcoin,namecoin/namecoin-core,apoelstra/bitcoin,lateminer/bitcoin,prusnak/bitcoin,bitcoinknots/bitcoin,lateminer/bitcoin,bitcoin/bitcoin,sstone/bitcoin,domob1812/namecore,dscotese/bitcoin,particl/particl-core,GroestlCoin/bitcoin,GroestlCoin/GroestlCoin,mruddy/bitcoin,ElementsProject/elements,bitcoinsSG/bitcoin,JeremyRubin/bitcoin,jambolo/bitcoin,jamesob/bitcoin,rnicoll/bitcoin,achow101/bitcoin,bitcoinsSG/bitcoin,sipsorcery/bitcoin,jlopp/statoshi,instagibbs/bitcoin,bitcoinknots/bitcoin,fujicoin/fujicoin,AkioNak/bitcoin,jlopp/statoshi,Sjors/bitcoin,JeremyRubin/bitcoin,pataquets/namecoin-core,pataquets/namecoin-core,jamesob/bitcoin,anditto/bitcoin,achow101/bitcoin,ElementsProject/elements,fujicoin/fujicoin,apoelstra/bitcoin,rnicoll/bitcoin,andreaskern/bitcoin,domob1812/namecore,lateminer/bitcoin,sipsorcery/bitcoin,fujicoin/fujicoin,particl/particl-core,dscotese/bitcoin,rnicoll/bitcoin,instagibbs/bitcoin,ajtowns/bitcoin,qtumproject/qtum,sipsorcery/bitcoin,sstone/bitcoin,apoelstra/bitcoin,mm-s/bitcoin,domob1812/namecore,jambolo/bitcoin,yenliangl/bitcoin,ajtowns/bitcoin,JeremyRubin/bitcoin,namecoin/namecore,GroestlCoin/GroestlCoin,namecoin/namecore,namecoin/namecoin-core,instagibbs/bitcoin,apoelstra/bitcoin,sipsorcery/bitcoin,GroestlCoin/bitcoin,jambolo/bitcoin,apoelstra/bitcoin,n1bor/bitcoin,prusnak/bitcoin,Sjors/bitcoin,instagibbs/bitcoin,bitcoin/bitcoin,GroestlCoin/bitcoin,mm-s/bitcoin,kallewoof/bitcoin,MeshCollider/bitcoin,domob1812/namecore,fanquake/bitcoin,andreaskern/bitcoin,particl/particl-core,lateminer/bitcoin,kallewoof/bitcoin,yenliangl/bitcoin,GroestlCoin/bitcoin,tecnovert/particl-core,MeshCollider/bitcoin,jlopp/statoshi,tecnovert/particl-core,AkioNak/bitcoin,MarcoFalke/bitcoin,GroestlCoin/GroestlCoin,qtumproject/qtum,sipsorcery/bitcoin,prusnak/bitcoin,qtumproject/qtum,ElementsProject/elements,fujicoin/fujicoin,MeshCollider/bitcoin,bitcoin/bitcoin,lateminer/bitcoin,andreaskern/bitcoin,bitcoinknots/bitcoin,bitcoin/bitcoin,MarcoFalke/bitcoin,particl/particl-core,anditto/bitcoin,particl/particl-core,kallewoof/bitcoin,andreaskern/bitcoin,particl/particl-core,namecoin/namecore,fujicoin/fujicoin,n1bor/bitcoin,GroestlCoin/GroestlCoin,pataquets/namecoin-core,qtumproject/qtum,ElementsProject/elements,domob1812/namecore,sstone/bitcoin,ElementsProject/elements,AkioNak/bitcoin,domob1812/bitcoin,Sjors/bitcoin,fanquake/bitcoin,namecoin/namecore,anditto/bitcoin,n1bor/bitcoin,dscotese/bitcoin,fanquake/bitcoin,bitcoinsSG/bitcoin,n1bor/bitcoin,namecoin/namecoin-core,MarcoFalke/bitcoin,ajtowns/bitcoin,domob1812/bitcoin,bitcoinsSG/bitcoin,domob1812/bitcoin,namecoin/namecoin-core,tecnovert/particl-core,prusnak/bitcoin,MeshCollider/bitcoin,sstone/bitcoin,jlopp/statoshi,mruddy/bitcoin,instagibbs/bitcoin,sipsorcery/bitcoin,JeremyRubin/bitcoin,pataquets/namecoin-core,domob1812/bitcoin,namecoin/namecoin-core,sstone/bitcoin,pataquets/namecoin-core,mm-s/bitcoin,bitcoin/bitcoin,Xekyo/bitcoin,jambolo/bitcoin,Xekyo/bitcoin,prusnak/bitcoin,jlopp/statoshi,mruddy/bitcoin,kallewoof/bitcoin,prusnak/bitcoin,mm-s/bitcoin,Xekyo/bitcoin,Xekyo/bitcoin,n1bor/bitcoin,MarcoFalke/bitcoin,dscotese/bitcoin,achow101/bitcoin,MeshCollider/bitcoin,ajtowns/bitcoin,ajtowns/bitcoin,qtumproject/qtum,fanquake/bitcoin,andreaskern/bitcoin,rnicoll/bitcoin,instagibbs/bitcoin,yenliangl/bitcoin,domob1812/bitcoin,GroestlCoin/GroestlCoin,namecoin/namecoin-core,lateminer/bitcoin,jambolo/bitcoin,apoelstra/bitcoin,jamesob/bitcoin,GroestlCoin/bitcoin