doc: Clarify RPC versioning
doc: Clarify RPC versioning

JeremyRubin/bitcoin,sstone/bitcoin,AkioNak/bitcoin,practicalswift/bitcoin,qtumproject/qtum,mm-s/bitcoin,pataquets/namecoin-core,n1bor/bitcoin,tjps/bitcoin,apoelstra/bitcoin,Xekyo/bitcoin,instagibbs/bitcoin,GroestlCoin/bitcoin,fujicoin/fujicoin,wellenreiter01/Feathercoin,pataquets/namecoin-core,andreaskern/bitcoin,nikkitan/bitcoin,rnicoll/bitcoin,afk11/bitcoin,Xekyo/bitcoin,anditto/bitcoin,namecoin/namecoin-core,kallewoof/bitcoin,prusnak/bitcoin,jtimon/bitcoin,practicalswift/bitcoin,peercoin/peercoin,practicalswift/bitcoin,FeatherCoin/Feathercoin,apoelstra/bitcoin,nikkitan/bitcoin,namecoin/namecore,fanquake/bitcoin,monacoinproject/monacoin,ElementsProject/elements,JeremyRubin/bitcoin,ElementsProject/elements,alecalve/bitcoin,gjhiggins/vcoincore,vertcoin/vertcoin,jtimon/bitcoin,achow101/bitcoin,ajtowns/bitcoin,DigitalPandacoin/pandacoin,DigitalPandacoin/pandacoin,mitchellcash/bitcoin,kallewoof/bitcoin,tecnovert/particl-core,MeshCollider/bitcoin,prusnak/bitcoin,FeatherCoin/Feathercoin,achow101/bitcoin,jambolo/bitcoin,GroestlCoin/GroestlCoin,jamesob/bitcoin,peercoin/peercoin,Sjors/bitcoin,ahmedbodi/vertcoin,sstone/bitcoin,andreaskern/bitcoin,fanquake/bitcoin,rnicoll/dogecoin,DigitalPandacoin/pandacoin,namecoin/namecoin-core,yenliangl/bitcoin,AkioNak/bitcoin,jlopp/statoshi,GroestlCoin/GroestlCoin,peercoin/peercoin,domob1812/namecore,apoelstra/bitcoin,GroestlCoin/bitcoin,ElementsProject/elements,fanquake/bitcoin,EthanHeilman/bitcoin,jnewbery/bitcoin,jnewbery/bitcoin,alecalve/bitcoin,rnicoll/bitcoin,afk11/bitcoin,wellenreiter01/Feathercoin,jtimon/bitcoin,pstratem/bitcoin,EthanHeilman/bitcoin,jonasschnelli/bitcoin,yenliangl/bitcoin,yenliangl/bitcoin,andreaskern/bitcoin,CryptArc/bitcoin,anditto/bitcoin,tecnovert/particl-core,nikkitan/bitcoin,CryptArc/bitcoin,kallewoof/bitcoin,apoelstra/bitcoin,jonasschnelli/bitcoin,particl/particl-core,tjps/bitcoin,litecoin-project/litecoin,midnightmagic/bitcoin,ahmedbodi/vertcoin,AkioNak/bitcoin,CryptArc/bitcoin,namecoin/namecoin-core,pstratem/bitcoin,namecoin/namecore,domob1812/namecore,qtumproject/qtum,lateminer/bitcoin,MeshCollider/bitcoin,FeatherCoin/Feathercoin,dscotese/bitcoin,MarcoFalke/bitcoin,vertcoin/vertcoin,tjps/bitcoin,tjps/bitcoin,CryptArc/bitcoin,ajtowns/bitcoin,pataquets/namecoin-core,jtimon/bitcoin,achow101/bitcoin,jonasschnelli/bitcoin,MarcoFalke/bitcoin,namecoin/namecoin-core,MarcoFalke/bitcoin,domob1812/bitcoin,pstratem/bitcoin,GroestlCoin/GroestlCoin,bitcoin/bitcoin,sipsorcery/bitcoin,bitcoin/bitcoin,bitcoinsSG/bitcoin,dscotese/bitcoin,mruddy/bitcoin,anditto/bitcoin,domob1812/bitcoin,jlopp/statoshi,ahmedbodi/vertcoin,monacoinproject/monacoin,apoelstra/bitcoin,domob1812/bitcoin,lateminer/bitcoin,GroestlCoin/bitcoin,bitcoin/bitcoin,wellenreiter01/Feathercoin,gjhiggins/vcoincore,anditto/bitcoin,litecoin-project/litecoin,jamesob/bitcoin,sipsorcery/bitcoin,mitchellcash/bitcoin,MarcoFalke/bitcoin,dscotese/bitcoin,ajtowns/bitcoin,rnicoll/dogecoin,particl/particl-core,rnicoll/bitcoin,alecalve/bitcoin,anditto/bitcoin,andreaskern/bitcoin,wellenreiter01/Feathercoin,jtimon/bitcoin,n1bor/bitcoin,litecoin-project/litecoin,nikkitan/bitcoin,cdecker/bitcoin,bitcoin/bitcoin,ajtowns/bitcoin,mitchellcash/bitcoin,dscotese/bitcoin,domob1812/namecore,yenliangl/bitcoin,monacoinproject/monacoin,achow101/bitcoin,AkioNak/bitcoin,midnightmagic/bitcoin,monacoinproject/monacoin,jambolo/bitcoin,domob1812/namecore,EthanHeilman/bitcoin,particl/particl-core,peercoin/peercoin,jnewbery/bitcoin,prusnak/bitcoin,practicalswift/bitcoin,bitcoinknots/bitcoin,jamesob/bitcoin,tecnovert/particl-core,midnightmagic/bitcoin,MeshCollider/bitcoin,instagibbs/bitcoin,jlopp/statoshi,vertcoin/vertcoin,practicalswift/bitcoin,GroestlCoin/GroestlCoin,cdecker/bitcoin,cdecker/bitcoin,practicalswift/bitcoin,qtumproject/qtum,cdecker/bitcoin,jonasschnelli/bitcoin,pstratem/bitcoin,jambolo/bitcoin,mruddy/bitcoin,qtumproject/qtum,Xekyo/bitcoin,ahmedbodi/vertcoin,fujicoin/fujicoin,fujicoin/fujicoin,DigitalPandacoin/pandacoin,FeatherCoin/Feathercoin,bitcoinknots/bitcoin,jlopp/statoshi,DigitalPandacoin/pandacoin,jamesob/bitcoin,qtumproject/qtum,gjhiggins/vcoincore,cdecker/bitcoin,domob1812/bitcoin,Sjors/bitcoin,mruddy/bitcoin,ElementsProject/elements,instagibbs/bitcoin,jlopp/statoshi,afk11/bitcoin,mruddy/bitcoin,DigitalPandacoin/pandacoin,alecalve/bitcoin,JeremyRubin/bitcoin,namecoin/namecore,andreaskern/bitcoin,ahmedbodi/vertcoin,namecoin/namecore,fujicoin/fujicoin,pataquets/namecoin-core,bitcoin/bitcoin,domob1812/namecore,Sjors/bitcoin,GroestlCoin/bitcoin,ajtowns/bitcoin,midnightmagic/bitcoin,AkioNak/bitcoin,wellenreiter01/Feathercoin,pataquets/namecoin-core,vertcoin/vertcoin,Xekyo/bitcoin,pataquets/namecoin-core,alecalve/bitcoin,afk11/bitcoin,n1bor/bitcoin,Xekyo/bitcoin,gjhiggins/vcoincore,CryptArc/bitcoin,vertcoin/vertcoin,Sjors/bitcoin,GroestlCoin/GroestlCoin,andreaskern/bitcoin,MarcoFalke/bitcoin,sipsorcery/bitcoin,rnicoll/bitcoin,namecoin/namecoin-core,wellenreiter01/Feathercoin,monacoinproject/monacoin,FeatherCoin/Feath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