[libsoup] gtkdoc: set the documentation namespace

[Claudio Saavedra <csaavedra src gnome org>]

commit 716acf96c8368ad17c6a257890387659def591e5
Author: Claudio Saavedra <csaavedra igalia com>
Date:   Thu May 16 18:37:10 2019 +0300

    gtkdoc: set the documentation namespace
    
    This prevents all documentation to be indexed under S in the index.

 docs/reference/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/docs/reference/meson.build b/docs/reference/meson.build
index 56d98686..99b991a9 100644
--- a/docs/reference/meson.build
+++ b/docs/reference/meson.build
@@ -57,6 +57,7 @@ gnome.gtkdoc('libsoup-2.4',
   main_sgml : 'libsoup-2.4-docs.sgml',
   src_dir : srcdir,
   ignore_headers : ignore_headers,
+  namespace : 'soup',
   mkdb_args : mkdb_args,
   scan_args : scan_args,
   dependencies : libsoup_dep,