[gnome-shell/wip/hadess/fix-docs-interface-prefix] docs: Fix interface prefix for D-Bus docs

[Bastien Nocera <hadess src gnome org>]

commit 17e32bf16dc7fad5a826183cffbaaae59d719eee
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Jul 25 14:40:11 2019 +0200

    docs: Fix interface prefix for D-Bus docs
    
    The --interface-prefix= gtk-doc argument was being passed a stringified
    array instead of a simple string.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/644

 docs/reference/shell/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/docs/reference/shell/meson.build b/docs/reference/shell/meson.build
index a963db792..9d8bbfd19 100644
--- a/docs/reference/shell/meson.build
+++ b/docs/reference/shell/meson.build
@@ -28,7 +28,7 @@ foreach iface : ifaces
     output: 'doc-gen-' + iface[1],
     command: [
       'gdbus-codegen',
-      '--interface-prefix=@0@.'.format(iface),
+      '--interface-prefix=@0@.'.format(iface[0]),
       '--generate-docbook', 'doc-gen',
       '--output-directory', '@OUTDIR@',
       '@INPUT@'