CH02: remove some specific amounts

Remove some specific amounts and numbers to make updating the text in
the future easier.  The removed values don't add anything to the text.

ch02.asciidoc

@@ -81,12 +81,6 @@ Alice is offered the option to pay with bitcoin, in addition to the
 usual options. The checkout cart displays the price in US dollars and
 also in bitcoin (BTC), at Bitcoin's prevailing exchange rate.
 
-----
-Total:
-$750 USD
-0.01577764 BTC
-----
-
 ((("payment requests")))((("QR codes", "payment requests")))Bob's
 e-commerce system will automatically create a QR code containing an
 _invoice_ (see <<invoice-QR>>).
@@ -130,7 +124,7 @@ A description for the payment: "Purchase at Bob's Store"
 ----
 
 Alice uses her smartphone to scan the barcode on display. Her smartphone
-shows a payment of +0.01 BTC+ to +Bob's Store+ and she selects Send to
+shows a payment for the correct amount to +Bob's Store+ and she selects Send to
 authorize the payment. Within a few seconds (about the same amount of
 time as a credit card authorization), Bob sees the transaction on the
 register, completing the transaction.
@@ -432,8 +426,8 @@ View the https://www.blockchain.com/btc/tx/0627052b6f28912f2703066a912ea577f2ce4
 
 ==== Adding the Transaction to the Ledger
 
-The transaction created by Alice's wallet application is 258 bytes long
-and contains everything necessary to confirm ownership of the funds and
+The transaction created by Alice's wallet application
+contains everything necessary to confirm ownership of the funds and
 assign new owners. Now, the transaction must be transmitted to the
 Bitcoin network where it will become part of the blockchain. In the next
 section we will see how a transaction becomes part of a new block and