doc: remove any mention of SOCKS4

SOCKS4 support was removed in 0127a9b, as well as the `-socks=` option.

contrib/debian/examples/bitcoin.conf

@@ -10,7 +10,7 @@
 # Run a regression test network
 #regtest=0
 
-# Connect via a socks4 proxy
+# Connect via a SOCKS5 proxy
 #proxy=127.0.0.1:9050
 
 ##############################################################

contrib/debian/manpages/bitcoin-qt.1

@@ -32,10 +32,7 @@ Set database cache size in megabytes (default: 25)
 Specify connection timeout in milliseconds (default: 5000)
 .TP
 \fB\-proxy=\fR<ip:port>
-Connect through socks proxy
-.TP
-\fB\-socks=\fR<n>
-Select the version of socks proxy to use (4\-5, default: 5)
+Connect through SOCKS5 proxy
 .TP
 \fB\-tor=\fR<ip:port>
 Use proxy to reach tor hidden services (default: same as \fB\-proxy\fR)

contrib/debian/manpages/bitcoind.1

@@ -28,7 +28,7 @@ Start minimized
 Specify data directory
 .TP
 \fB\-proxy=\fR<ip:port>
-Connect through socks4 proxy
+Connect through SOCKS5 proxy
 .TP
 \fB\-addnode=\fR<ip>
 Add a node to connect to

doc/tor.md

@@ -13,11 +13,6 @@ configure Tor.
 The first step is running Bitcoin behind a Tor proxy. This will already make all
 outgoing connections be anonymized, but more is possible.
 
-	-socks=5        SOCKS5 supports connecting-to-hostname, which can be used instead
-	                of doing a (leaking) local DNS lookup. SOCKS5 is the default,
-	                but SOCKS4 does not support this. (SOCKS4a does, but isn't
-	                implemented).
-
 	-proxy=ip:port  Set the proxy server. If SOCKS5 is selected (default), this proxy
 	                server will be used to try to reach .onion addresses as well.