Fix plural

In the chapter most of the time we can read satoshis in plural but
there are three times where we read it on singular

07_payment_channels.asciidoc

@@ -276,13 +276,13 @@ bc1q89ju02heg32yrqdrnqghe6132wek25p6sv6e564znvrvez7tq5zqt4dn02
 ----
 ==== Constructing the Funding Transaction
 
-((("payment channel","constructing the funding transaction")))Alice's node can now construct a funding transaction, sending the amount agreed on with Bob (`funding_satoshis`) to the 2-of-2 multisig address. Let's assume that funding_satoshis was 140,000 and Alice is spending a 200,000 satoshi output and creating 60,000 satoshi change. The transaction will look something like <<A_B_funding_Tx>>. 
+((("payment channel","constructing the funding transaction")))Alice's node can now construct a funding transaction, sending the amount agreed on with Bob (`funding_satoshis`) to the 2-of-2 multisig address. Let's assume that funding_satoshis was 140,000 and Alice is spending a 200,000 satoshis output and creating 60,000 satoshis change. The transaction will look something like <<A_B_funding_Tx>>.
 
 [[A_B_funding_Tx]]
 .Alice constructs the funding transaction
 image::images/mtln_0704.png["Alice constructs the funding transaction"]
 
-Alice _does not broadcast_ this transaction because doing so would put her 140,000 satoshi at risk. Once spent to the 2-of-2 multisig, there is no way for Alice to recover her money without Bob's signature.
+Alice _does not broadcast_ this transaction because doing so would put her 140,000 satoshis at risk. Once spent to the 2-of-2 multisig, there is no way for Alice to recover her money without Bob's signature.
 
 [role="pagebreak-before less_space"]
 .Dual-Funded Payment Channels