[addrman] Add doxygen comment to AddrMan::Add()
[addrman] Add doxygen comment to AddrMan::Add()

Does not document the return value since we're going to fix the
semantics in a future commit.

jambolo/bitcoin,Xekyo/bitcoin,GroestlCoin/GroestlCoin,MarcoFalke/bitcoin,prusnak/bitcoin,domob1812/namecore,fujicoin/fujicoin,kallewoof/bitcoin,andreaskern/bitcoin,domob1812/bitcoin,kallewoof/bitcoin,namecoin/namecoin-core,sipsorcery/bitcoin,mruddy/bitcoin,mruddy/bitcoin,andreaskern/bitcoin,pataquets/namecoin-core,instagibbs/bitcoin,jamesob/bitcoin,bitcoinknots/bitcoin,instagibbs/bitcoin,domob1812/namecore,tecnovert/particl-core,dscotese/bitcoin,lateminer/bitcoin,bitcoinsSG/bitcoin,GroestlCoin/GroestlCoin,lateminer/bitcoin,fujicoin/fujicoin,pataquets/namecoin-core,bitcoin/bitcoin,bitcoinknots/bitcoin,andreaskern/bitcoin,jambolo/bitcoin,sstone/bitcoin,bitcoinknots/bitcoin,anditto/bitcoin,namecoin/namecoin-core,GroestlCoin/GroestlCoin,jlopp/statoshi,dscotese/bitcoin,jamesob/bitcoin,anditto/bitcoin,instagibbs/bitcoin,dscotese/bitcoin,pataquets/namecoin-core,achow101/bitcoin,namecoin/namecore,sstone/bitcoin,particl/particl-core,bitcoinsSG/bitcoin,AkioNak/bitcoin,namecoin/namecore,sipsorcery/bitcoin,kallewoof/bitcoin,prusnak/bitcoin,GroestlCoin/bitcoin,dscotese/bitcoin,fujicoin/fujicoin,Xekyo/bitcoin,ajtowns/bitcoin,particl/particl-core,bitcoin/bitcoin,fanquake/bitcoin,namecoin/namecoin-core,sstone/bitcoin,namecoin/namecore,achow101/bitcoin,bitcoinknots/bitcoin,achow101/bitcoin,AkioNak/bitcoin,namecoin/namecoin-core,namecoin/namecore,ajtowns/bitcoin,GroestlCoin/bitcoin,GroestlCoin/GroestlCoin,lateminer/bitcoin,AkioNak/bitcoin,fujicoin/fujicoin,andreaskern/bitcoin,MarcoFalke/bitcoin,jamesob/bitcoin,jambolo/bitcoin,namecoin/namecore,tecnovert/particl-core,namecoin/namecoin-core,mruddy/bitcoin,mruddy/bitcoin,dscotese/bitcoin,bitcoin/bitcoin,mm-s/bitcoin,jlopp/statoshi,pataquets/namecoin-core,GroestlCoin/GroestlCoin,tecnovert/particl-core,jambolo/bitcoin,jamesob/bitcoin,fanquake/bitcoin,prusnak/bitcoin,domob1812/namecore,prusnak/bitcoin,instagibbs/bitcoin,namecoin/namecoin-core,MarcoFalke/bitcoin,jlopp/statoshi,jambolo/bitcoin,GroestlCoin/bitcoin,tecnovert/particl-core,namecoin/namecore,fanquake/bitcoin,jlopp/statoshi,domob1812/bitcoin,mruddy/bitcoin,particl/particl-core,domob1812/bitcoin,jamesob/bitcoin,achow101/bitcoin,anditto/bitcoin,AkioNak/bitcoin,pataquets/namecoin-core,sipsorcery/bitcoin,Xekyo/bitcoin,pataquets/namecoin-core,mm-s/bitcoin,fanquake/bitcoin,particl/particl-core,instagibbs/bitcoin,particl/particl-core,Xekyo/bitcoin,MarcoFalke/bitcoin,domob1812/namecore,mm-s/bitcoin,jlopp/statoshi,andreaskern/bitcoin,anditto/bitcoin,ajtowns/bitcoin,achow101/bitcoin,particl/particl-core,Xekyo/bitcoin,domob1812/bitcoin,kallewoof/bitcoin,lateminer/bitcoin,fanquake/bitcoin,tecnovert/particl-core,kallewoof/bitcoin,instagibbs/bitcoin,jlopp/statoshi,anditto/bitcoin,domob1812/bitcoin,tecnovert/particl-core,anditto/bitcoin,jambolo/bitcoin,dscotese/bitcoin,bitcoin/bitcoin,bitcoinknots/bitcoin,MarcoFalke/bitcoin,mm-s/bitcoin,sipsorcery/bitcoin,mruddy/bitcoin,bitcoinsSG/bitcoin,bitcoinsSG/bitcoin,sstone/bitcoin,domob1812/bitcoin,kallewoof/bitcoin,mm-s/bitcoin,AkioNak/bitcoin,ajtowns/bitcoin,sstone/bitcoin,bitcoinsSG/bitcoin,AkioNak/bitcoin,bitcoin/bitcoin,jamesob/bitcoin,fujicoin/fujicoin,ajtowns/bitcoin,domob1812/namecore,sipsorcery/bitcoin,GroestlCoin/bitcoin,prusnak/bitcoin,lateminer/bitcoin,fanquake/bitcoin,ajtowns/bitcoin,Xekyo/bitcoin,sipsorcery/bitcoin,bitcoinsSG/bitcoin,achow101/bitcoin,lateminer/bitcoin,andreaskern/bitcoin,prusnak/bitcoin,MarcoFalke/bitcoin,sstone/bitcoin,fujicoin/fujicoin,GroestlCoin/bitcoin,domob1812/namecore,GroestlCoin/GroestlCoin,GroestlCoin/bitcoin,mm-s/bitcoin,bitcoin/bitcoin