[gtk+] CssProvider: Fix doc of min theme version loaded

[Daniel Boles <dboles src gnome org>]

commit 6f54e1fc6d2cbba83a75004007cefaca4ea4caac
Author: Daniel Boles <dboles src gmail com>
Date:   Wed Nov 8 06:51:32 2017 +0000

    CssProvider: Fix doc of min theme version loaded
    
    The code shows that we only load back to 4.0, but this still said 3.0.

 gtk/gtkcssprovider.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkcssprovider.c b/gtk/gtkcssprovider.c
index 456347d..4cc2036 100644
--- a/gtk/gtkcssprovider.c
+++ b/gtk/gtkcssprovider.c
@@ -71,7 +71,7 @@
  * is the prefix configured when GTK+ was compiled (unless overridden by the
  * `GTK_DATA_PREFIX` environment variable), and `VERSION` is the GTK+ version number.
  * If no file is found for the current version, GTK+ tries older versions all the
- * way back to 3.0.
+ * way back to 4.0.
  *
  * In the same way, GTK+ tries to load a gtk-keys.css file for the current
  * key theme, as defined by #GtkSettings:gtk-key-theme-name.