[gedit] meson: Don't include version number in gtk_doc install dir

[Jeremy Bicha <jbicha src gnome org>]

commit 9661b8570977f02dd2a72d2c3f11798f6c8f9e2f
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Wed Jan 9 21:12:10 2019 -0500

    meson: Don't include version number in gtk_doc install dir
    
    This matches our autotools behavior

 docs/reference/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/docs/reference/meson.build b/docs/reference/meson.build
index acceb544a..48e9020a6 100644
--- a/docs/reference/meson.build
+++ b/docs/reference/meson.build
@@ -99,6 +99,6 @@ gnome.gtkdoc(
   install_dir: join_paths(
     gtkdocdir,
     'html',
-    package_string,
+    package_name,
   )
 )