minor improvements in Note (#179)

- 2-out-of-2 is more consistent (see usage above) and carries more information than 2-2
- comma after however needed

ch03.asciidoc

@@ -30,10 +30,10 @@ When someone says they 'own' bitcoin they typically mean that they know the priv
 The private key allows the owner to produce a signature for a transaction that spends the bitcoin by sending it to a different address.
 Thus 'ownership' of bitcoin can be defined as the ability to spend that bitcoin.
 
-If you have an unpublished but signed transaction from a 2-2 multisignature address, where some outputs are sent to an address you own, and additionally you own one of the private keys of the multisignature address, then you effectively own the bitcoin of that output.
-Without your help no other transaction from the 2-2 multisignature address can be produced.
-However without the help of anybody else you can transfer the funds to an address which you control.
-On the Lightning Network ownership of your funds is almost always encoded with you having a pre-signed transaction spending from a 2-2 multisignature address.
+If you have an unpublished but signed transaction from a 2-out-of-2 multisignature address, where some outputs are sent to an address you own, and additionally you own one of the private keys of the multisignature address, then you effectively own the bitcoin of that output.
+Without your help no other transaction from the 2-out-of-2 multisignature address can be produced.
+However, without the help of anybody else you can transfer the funds to an address which you control.
+On the Lightning Network ownership of your funds is almost always encoded with you having a pre-signed transaction spending from a 2-out-of-2 multisignature address.
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 Additionally these contracts have the option to connect channels in a way that one can forward payments from one channel to another.