docs: fix git-over-http description

This has now finally been setup.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

docs/git.html

@@ -13,7 +13,12 @@ git clone git://git.buildroot.net/buildroot</pre>
 Or if you're behind a firewall blocking git:
 
 <pre>
-git clone http://git.buildroot.net/buildroot</pre>
+git clone http://git.buildroot.net/git/buildroot.git</pre>
+
+<p>
+
+Please use the native git protocol if at all possible, as it's a lot
+more efficient than HTTP.
 
 <p>