[master] 7ef9b11 Mention that varnishd -x outputs RST

[Dridi Boukelmoune]

commit 7ef9b110ed70d4ff2bea54010d8f756216052772
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Mon Mar 13 17:44:18 2017 +0100

    Mention that varnishd -x outputs RST

diff --git a/doc/sphinx/reference/varnishd.rst b/doc/sphinx/reference/varnishd.rst
index 73d0c97..3b34004 100644
--- a/doc/sphinx/reference/varnishd.rst
+++ b/doc/sphinx/reference/varnishd.rst
@@ -82,7 +82,8 @@ Documentation options
 ---------------------
 
 For these options, `varnishd` prints information to standard output
-and exits. When a -x option is used, it must be the only option.
+and exits. When a -x option is used, it must be the only option (it
+outputs documentation in reStructuredText, aka RST).
 
 -?