[debian] Update bitcoind manpage description

Update the description to match that description in
the main bitcoin README.md

contrib/debian/manpages/bitcoind.1

@@ -6,9 +6,7 @@ bitcoin [options] <command> [params]
 .TP
 bitcoin [options] help <command> \- Get help for a command
 .SH DESCRIPTION
-This  manual page documents the bitcoind program. Bitcoin is a peer-to-peer digital currency. Peer-to-peer (P2P) means that there is no central authority to issue new money or keep track of transactions. Instead, these tasks are managed collectively by the nodes of the network. Advantages:
-
-Bitcoins can be sent easily through the Internet, without having to trust middlemen. Transactions are designed to be irreversible. Be safe from instability caused by fractional reserve banking and central banks. The limited inflation of the Bitcoin system’s money supply is distributed evenly (by CPU power) throughout the network, not monopolized by banks.
+This  manual page documents the bitcoind program. Bitcoin is an experimental new digital currency that enables instant payments to anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Bitcoin Core is the name of open source software which enables the use of this currency.
 
 .SH OPTIONS
 .TP