[libsoup] meson: Specify the right dependency when building documentation

[Tomas Popela <tpopela src gnome org>]

commit 373dbc81ecfd4c7f5587fe89dd290641a066c122
Author: Tomas Popela <tpopela redhat com>
Date:   Thu Aug 30 11:42:30 2018 +0200

    meson: Specify the right dependency when building documentation
    
    Closes: #8

 docs/reference/meson.build | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
---
diff --git a/docs/reference/meson.build b/docs/reference/meson.build
index 1daf1e15..12105016 100644
--- a/docs/reference/meson.build
+++ b/docs/reference/meson.build
@@ -59,10 +59,7 @@ gnome.gtkdoc('libsoup-2.4',
   ignore_headers : ignore_headers,
   mkdb_args : mkdb_args,
   scan_args : scan_args,
-  dependencies : [
-    glib_dep,
-    libxml_dep
-  ],
+  dependencies : libsoup_dep,
   install : true,
   content_files: [
     'build-howto.xml',