Made changes to ch03.asciidoc

ch03.asciidoc

@@ -8,7 +8,7 @@ You can download the reference client _Bitcoin Core_, also known as the "Satoshi
 Go to http://bitcoin.org/en/choose-your-wallet and select "Bitcoin Core" to download the reference client. Depending on your operating system, you will download an executable installer. For Windows, this is either a ZIP archive or an EXE executable. For Mac OS it is a DMG disk image. Linux versions include a PPA package for Ubuntu or a TAR.GZ archive. The web page listing recommended bitcoin clients is shown in <<bitcoin-choose-client>>.
 
 [[bitcoin-choose-client]]
-.Bitcoin - Choose a bitcoin client
+.Bitcoin—Choose a bitcoin client
 image::images/msbt_0301.png["bitcoin choose client"]
 
 ==== Running Bitcoin Core for the First Time
@@ -23,7 +23,7 @@ Bitcoin Core keeps a full copy of the transaction ledger (blockchain), with ever
 ====
  
 [[bitcoin-qt-firstload]]
-.Bitcoin Core - The graphical user interface, during the blockchain initialization
+.Bitcoin Core—The graphical user interface, during the blockchain initialization
 image::images/msbt_0302.png["bitcoin-qt first run"]