Update metamask console to Geth console + Ropsten

Metamask's web3 interface functionality is being deprecated so I'm suggesting people to use Geth console instead. 

Also noted that this is for Ropsten testnet - not mainnet. this is something the original text missed.

06transactions.asciidoc

@@ -57,7 +57,7 @@ In summary, it is important to note that the use of the nonce is actually vital
 [[tracking_nonce]]
 ==== Keeping Track of Nonces
 
-((("nonces","keeping track of")))In practical terms, the nonce is an up-to-date count of the number of _confirmed_ (i.e., on-chain) transactions that have originated from an account. To find out what the nonce is, you can interrogate the blockchain, for example via the web3 interface. Open a JavaScript console in a browser with MetaMask running, or use the +truffle console+ command to access the JavaScript web3 library, then type:
+((("nonces","keeping track of")))In practical terms, the nonce is an up-to-date count of the number of _confirmed_ (i.e., on-chain) transactions that have originated from an account. To find out what the nonce is, you can interrogate the blockchain, for example via the web3 interface. Open a JavaScript console in Geth (or your preferred web3 interface) on Ropsten testnet, then type:
 
 ++++
 <pre data-type="programlisting">