Add full stop to end of sentence

Author: tcharding

03_3_Setting_Up_Your_Wallet.md

@@ -38,7 +38,7 @@ Classic Bitcoin transactions created P2PKH addresses that added an additional cr
 
 As described more fully in [§4.6: Creating a Segwit Transaction](04_6_Creating_a_Segwit_Transaction.md), the Block Size Wars of the late '10s resulted in a new sort of address: SegWit. This is the preferred sort of address currently, and should be fully integrated into Bitcoin-Core at this point, but nonetheless we're saving it for §4.6.
 
-SegWit simply means "segregated witness" and it's a way of separating the transaction signatures out from the rest of the transaction to reduce transaction size. Some SegWit addresses will sneak into some of our examples prior to §4.6 as change addresses, which you'll see as addresses that begin with "tb". This is fine because the `bitcoin-cli` entirely supports their usage. But we won't use them otherwise
+SegWit simply means "segregated witness" and it's a way of separating the transaction signatures out from the rest of the transaction to reduce transaction size. Some SegWit addresses will sneak into some of our examples prior to §4.6 as change addresses, which you'll see as addresses that begin with "tb". This is fine because the `bitcoin-cli` entirely supports their usage. But we won't use them otherwise.
 
 There are two addresses of this sort: