Clarify behavior in docs, #61777 (gtk_text_iter_forward_search)

Clarify behavior in docs, #61777 (gtk_text_iter_forward_search)

2001-10-22  Havoc Pennington  <hp@redhat.com>

	* gtk/gtktextiter.c (gtk_text_iter_set_line): Clarify behavior in
	docs, #61777
	(gtk_text_iter_forward_search) (gtk_text_iter_backward_search):
	change the two boolean args to a flags field, so we can extend
	to add case insensitive, regexp searches later. #61852