docs: Add info describing model commit messages.
docs: Add info describing model commit messages.

mathiasrw/btcd,soapboxsys/ombfullnode,jcmincke/dcrd,Stash-Crypto/btcd,stevenroose/btcd,wallclockbuilder/btcd,pkothbauer/btcd,decred/dcrd,Roasbeef/btcd,jrick/btcd,BitGo/prova,hectorj/btcd,jongillham/btcd,jcmincke/dcrd,BitGo/prova,dan-da/btcd,jrick/dcrd,pkothbauer/btcd,wallclockbuilder/btcd,jcmincke/dcrd,stevenroose/btcd,dajohi/btcd,cqswxj2013/btcd,Cleawing/btcd,Stash-Crypto/btcd,CryptocurrencyCabal/htcd,adiabat/btcd,CryptocurrencyCabal/htcd,jongillham/btcd,mathiasrw/btcd,dan-da/btcd,qchain/btcd,hectorj/btcd,tb00/btcd,decred/dcrd,dajohi/btcd,aakselrod/btcd,toddfries/btcd,ltcsuite/ltcd,runeaune/btcd,ppcsuite/ppcd,adiabat/btcd,dajohi/btcd,tb00/btcd,aakselrod/btcd,btcsuite/btcd,cqswxj2013/btcd,jrick/btcd,davecgh/btcd,davecgh/btcd,ppcsuite/ppcd,jrick/dcrd,Cleawing/btcd,btcsuite/btcd,toddfries/btcd,Roasbeef/btcd,runeaune/btcd,soapboxsys/ombfullnode,qchain/btcd,jrick/btcd,ltcsuite/ltcd