rpc: add missing HelpExampleRpc for getblockfilter
rpc: add missing HelpExampleRpc for getblockfilter

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t/monacoin,yenliangl/bitcoin,anditto/bitcoin,dscotese/bitcoin,MarcoFalke/bitcoin,cdecker/bitcoin,cdecker/bitcoin,practicalswift/bitcoin,domob1812/bitcoin,particl/particl-core,jnewbery/bitcoin,mruddy/bitcoin,dscotese/bitcoin,mruddy/bitcoin,MarcoFalke/bitcoin,EthanHeilman/bitcoin,bitcoinsSG/bitcoin,particl/particl-core,sstone/bitcoin,bitcoinknots/bitcoin,namecoin/namecore,pstratem/bitcoin,n1bor/bitcoin,namecoin/namecoin-core,jamesob/bitcoin,DigitalPandacoin/pandacoin,GroestlCoin/GroestlCoin,ElementsProject/elements,jlopp/statoshi,jonasschnelli/bitcoin,tecnovert/particl-core,namecoin/namecoin-core,GroestlCoin/GroestlCoin,apoelstra/bitcoin,instagibbs/bitcoin,rnicoll/bitcoin,AkioNak/bitcoin,Xekyo/bitcoin,sstone/bitcoin,practicalswift/bitcoin,tecnovert/particl-core,Xekyo/bitcoin,namecoin/namecore,Sjors/bitcoin,mm-s/bitcoin,rnicoll/dogecoin,ahmedbodi/vertcoin,ahmedbodi/vertcoin,ajtowns/bitcoin,jambolo/bitcoin,jambolo/bitcoin,mruddy/bitcoin,anditto/bitcoin,fujicoin/fujicoin,mm-s/bitcoin,pstratem/bitcoin,bitcoinsSG/bitcoin,ahmedbodi/vertcoin,qtumproject/qtum,vertcoin/vertcoin,namecoin/namecoin-core,domob1812/bitcoin,GroestlCoin/bitcoin,prusnak/bitcoin,fujicoin/fujicoin,andreaskern/bitcoin,bitcoinsSG/bitcoin,mm-s/bitcoin,jlopp/statoshi,midnightmagic/bitcoin,practicalswift/bitcoin,instagibbs/bitcoin