[hackers] [surf] Add some description for the plumb feature. || Christoph Lohmann

[git]

commit b36921fbe87631ead6e57aebf348aa5beca3ddca
Author: Christoph Lohmann <2...@r-36.net>
Date:   Mon Jan 19 22:16:07 2015 +0100

    Add some description for the plumb feature.

diff --git a/config.def.h b/config.def.h
index 2baafef..e3b9881 100644
--- a/config.def.h
+++ b/config.def.h
@@ -54,6 +54,9 @@ static Bool allowgeolocation      = TRUE;
 }
 
 /* PLUMB(URI) */
+/* This called when some URI which does not begin with "about:",
+ * "http://"; or "https://"; should be opened.
+ */
 #define PLUMB(u) {\
        .v = (char *[]){ "/bin/sh", "-c", \
                "xdg-open \"$0\"", u, NULL \