gtk_init*(): Document that argc/argv can be 0,NULL.
* gtk/gtkmain.c: (gtk_init): Mention that argc and argv can be 0, using the new text from the g_applicatoin_run() documentation. There was already introspection annotation about that. (gtk_init_check, gtk_init_with_args): Use the same text here. See bug #643649 comment 2.
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