docs: Fix link to g_signal_emit()

gdk/gdkclipboard.c

@@ -1256,7 +1256,7 @@ gdk_clipboard_set_content (GdkClipboard       *clipboard,
  *
  * Values should be passed the same way they are passed to other value
  * collecting APIs, such as [`method@GObject.Object.set`] or
- * [`id@g_signal_emit`].
+ * [`func@GObject.signal_emit`].
  *
  * ```c
  * gdk_clipboard_set (clipboard, GTK_TYPE_STRING, "Hello World");