Git url doc: mark ftp/ftps as read-only and deprecate them

It is not even worth mentioning their removal; just discourage
people from using them.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/urls.txt b/Documentation/urls.txt
index 2890194..1d15ee7 100644
--- a/Documentation/urls.txt
+++ b/Documentation/urls.txt
@@ -6,8 +6,12 @@
 Depending on the transport protocol, some of this information may be
 absent.
 
-Git natively supports ssh, git, http, https, ftp, ftps, and rsync
-protocols. The following syntaxes may be used with them:
+Git supports ssh, git, http, and https protocols (in addition, ftp,
+and ftps can be used for fetching and rsync can be used for fetching
+and pushing, but these are inefficient and deprecated; do not use
+them).
+
+The following syntaxes may be used with them:
 
 - ssh://{startsb}user@{endsb}host.xz{startsb}:port{endsb}/path/to/repo.git/
 - git://host.xz{startsb}:port{endsb}/path/to/repo.git/