Fix documentation for core.gitproxy to reflect code

The current implementation of core.gitproxy only operates on
git:// URLs, so the ssh:// examples and custom protocol examples
have been removed or edited.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/git-config.txt b/Documentation/git-config.txt
index 8451ccc..c3dffff 100644
--- a/Documentation/git-config.txt
+++ b/Documentation/git-config.txt
@@ -214,9 +214,7 @@
 
 	; Proxy settings
 	[core]
-		gitproxy="ssh" for "ssh://kernel.org/"
 		gitproxy="proxy-command" for kernel.org
-		gitproxy="myprotocol-command" for "my://"
 		gitproxy=default-proxy ; for all the rest
 
 you can set the filemode to true with
@@ -291,7 +289,7 @@
 To add a new proxy, without altering any of the existing ones, use
 
 ------------
-% git config core.gitproxy '"proxy" for example.com'
+% git config core.gitproxy '"proxy-command" for example.com'
 ------------