[master] a9f56f6ab Fix typo

[Dridi Boukelmoune]

commit a9f56f6ab2a093718d88b55d72b7d7638b8822cb
Author: Jordan Christiansen <jordan.christiansen at target.com>
Date:   Tue Apr 28 12:56:00 2020 -0500

    Fix typo

diff --git a/doc/sphinx/reference/vmod.rst b/doc/sphinx/reference/vmod.rst
index 1c5e2ee4d..faa5e374d 100644
--- a/doc/sphinx/reference/vmod.rst
+++ b/doc/sphinx/reference/vmod.rst
@@ -144,7 +144,7 @@ valid invocations from vcl::
 	debug.argtest("1", four=6);
 
 The C interface does not change with named arguments and default
-values, arguments remain positional and defaul values appear no
+values, arguments remain positional and default values appear no
 different to user specified values.
 
 `Note` that default values have to be given in the native C-type