[mutter] backend: Clarify comment

[Jasper St. Pierre <jstpierre src gnome org>]

commit 75b5d15598f47557da9bfcc76901d7bd9f28bc58
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Apr 21 20:40:36 2014 -0400

    backend: Clarify comment

 src/backends/meta-backend.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/backends/meta-backend.c b/src/backends/meta-backend.c
index f8e6738..42a4197 100644
--- a/src/backends/meta-backend.c
+++ b/src/backends/meta-backend.c
@@ -151,8 +151,8 @@ get_backend_type (void)
 static void
 meta_create_backend (void)
 {
-  /* The initializer above installs it in _backend so meta_get_backend
-   * is valid during initialization. */
+  /* meta_backend_init() above install the backend globally so
+   * so meta_get_backend() works even during initialization. */
   g_object_new (get_backend_type (), NULL);
 }