[glib] GObject: Clarify 8db5542803 by avoiding double -ve

[Daniel Boles <dboles src gnome org>]

commit 042ab215b2aba5f132d4abac40495ac7da9579fb
Author: Daniel Boles <dboles src gnome org>
Date:   Sun Apr 22 15:03:03 2018 +0100

    GObject: Clarify 8db5542803 by avoiding double -ve
    
    Make the wording easier to understand by saying what we do, rather than
    what we avoid doing if the relevant thing did not happen!

 gobject/gobject.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gobject/gobject.c b/gobject/gobject.c
index cef98b7f7..555ca3fae 100644
--- a/gobject/gobject.c
+++ b/gobject/gobject.c
@@ -487,7 +487,7 @@ g_object_do_class_init (GObjectClass *class)
    * in ::notify being emitted, even if the new value is the same as the old.
    * If they did pass %G_PARAM_EXPLICIT_NOTIFY, then this signal is emitted only
    * when they explicitly call g_object_notify() or g_object_notify_by_pspec(),
-   * and common practice is to avoid doing so if the value remained unchanged.
+   * and common practice is to do that only when the value has actually changed.
    *
    * This signal is typically used to obtain change notification for a
    * single property, by specifying the property name as a detail in the