[docs] Minor revisions to 0.11.2RC1 release notes
[docs] Minor revisions to 0.11.2RC1 release notes

- Revisions to text as proposed by Greg Maxwell
- Add Btcdrak to contributors for backporting #6884
- Fix spelling mistake

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AllanDoensen/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,CTRoundTable/Encrypted.Cash,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,marlengit/BitcoinUnlimited,marlengit/hardfork_prototype_1_mvf-bu,arruah/ensocoin,zetacoin/zetacoin,marlengit/hardfork_prototype_1_mvf-bu,NateBrune/bitcoin-fio,vericoin/vericoin-core,aniemerg/zcash,NateBrune/bitcoin-nate,nathan-at-least/zcash,NateBrune/bitcoin-fio,myriadteam/myriadcoin,Justaphf/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,argentumproject/argentum,zetacoin/zetacoin,BitcoinUnlimited/BitcoinUnlimited,NateBrune/bitcoin-fio,arruah/ensocoin,arruah/ensocoin,marlengit/BitcoinUnlimited,aniemerg/zcash,SartoNess/BitcoinUnlimited,loxal/zcash,nathan-at-least/zcash,krzysztofwos/BitcoinUnlimited,BitcoinUnlimited/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,BitcoinUnlimited/BitcoinUnlimited,myriadcoin/myriadcoin,SartoNess/BitcoinUnlimited,vericoin/vericoin-core,Justaphf/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,BitcoinUnlimited/BitcoinUnlimited,myriadcoin/myriadcoin,argentumproject/argentum,NateBrune/bitcoin-nate,arruah/ensocoin,krzysztofwos/BitcoinUnlimited,zetacoin/zetacoin,myriadteam/myriadcoin,NateBrune/bitcoin-fio,marlengit/hardfork_prototype_1_mvf-bu,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,bitcoinsSG/zcash,AllanDoensen/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,Bitcoin-com/BUcash,NateBrune/bitcoin-nate,loxal/zcash,myriadteam/myriadcoin,aniemerg/zcash,marlengit/hardfork_prototype_1_mvf-bu,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,marcusdiaz/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,argentumproject/argentum,myriadteam/myriadcoin,myriadcoin/myriadcoin,vericoin/vericoin-core,marlengit/BitcoinUnlimited,CTRoundTable/Encrypted.Cash,Bitcoin-com/BUcash,marcusdiaz/BitcoinUnlimited,nathan-at-least/zcash,marlengit/BitcoinUnlimited,CTRoundTable/Encrypted.Cash,BitcoinUnlimited/BitcoinUnlimited,myriadteam/myriadcoin,loxal/zcash,arruah/ensocoin,arruah/ensocoin,cddjr/BitcoinUnlimited,cddjr/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,bitcoinsSG/zcash,myriadteam/myriadcoin,Justaphf/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,myriadcoin/myriadcoin,argentumproject/argentum,CTRoundTable/Encrypted.Cash,NateBrune/bitcoin-fio,zetacoin/zetacoin,cddjr/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,loxal/zcash,nathan-at-least/zcash,BTCfork/hardfork_prototype_1_mvf-bu,bitcoinsSG/zcash,NateBrune/bitcoin-nate,zetacoin/zetacoin,marcusdiaz/BitcoinUnlimited,nathan-at-least/zcash,nathan-at-least/zcash,marcusdiaz/BitcoinUnlimited,NateBrune/bitcoin-nate,bitcoinsSG/zcash,krzysztofwos/BitcoinUnlimited,argentumproject/argentum,zetacoin/zetacoin,Bitcoin-com/BUcash,loxal/zcash,BTCfork/hardfork_prototype_1_mvf-bu,Justaphf/BitcoinUnlimited,Bitcoin-com/BUcash,SartoNess/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,Justaphf/BitcoinUnlimited,marlengit/BitcoinUnlimited,vericoin/vericoin-core,Justaphf/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,marlengit/hardfork_prototype_1_mvf-bu,marlengit/BitcoinUnlimited,cddjr/BitcoinUnlimited,argentumproject/argentum,argentumproject/argentum,SartoNess/BitcoinUnlimited,myriadcoin/myriadcoin,loxal/zcash,marlengit/hardfork_prototype_1_mvf-bu,marcusdiaz/BitcoinUnlimited,SartoNess/BitcoinUnlimited,Bitcoin-com/BUcash,NateBrune/bitcoin-nate,marcusdiaz/BitcoinUnlimited,SartoNess/BitcoinUnlimited,CTRoundTable/Encrypted.Cash,BitcoinUnlimited/BitcoinUnlimited,cddjr/BitcoinUnlimited,aniemerg/zcash,cddjr/BitcoinUnlimited,vericoin/vericoin-core,Bitcoin-com/BUcash,CTRoundTable/Encrypted.Cash,aniemerg/zcash,bitcoinsSG/zcash,BTCfork/hardfork_prototype_1_mvf-bu,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,NateBrune/bitcoin-fio,SartoNess/BitcoinUnlimited,bitcoinsSG/zcash,vericoin/vericoin-core,AllanDoensen/BitcoinUnlimited,myriadcoin/myriadcoin,aniemerg/zcash