[gxml/gxml-0.16] meson: rename target for documentation

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 8c39ab362a37dc722b93f3513a281cc6fdab1de2
Author: Daniel Espinosa Ortiz <esodan gmail com>
Date:   Fri Jan 25 14:58:06 2019 -0600

    meson: rename target for documentation

 docs/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/docs/meson.build b/docs/meson.build
index 52b2aa5..59fde87 100644
--- a/docs/meson.build
+++ b/docs/meson.build
@@ -10,7 +10,7 @@ vapidirgxml = '--vapidir='+join_paths (meson.current_source_dir (),'gxml')
 vapidirvapi = '--vapidir='+join_paths (meson.current_source_dir (),'vapi')
 docsdir = join_paths (get_option ('datadir'), 'devhelp','books')
 
-custom_target ('valadocs',
+custom_target ('gxml_valadocs',
                input : sources,
                output : outdir,
                command : [valadoc,