Fix some nonsensical g-i annotations

gst/gstbuffer.c

@@ -902,7 +902,7 @@ gst_buffer_new_wrapped (gpointer data, gsize size)
  * Get the amount of memory blocks that this buffer has. This amount is never
  * larger than what gst_buffer_get_max_memory() returns.
  *
- * Returns: (transfer full): the amount of memory block in this buffer.
+ * Returns: the number of memory blocks this buffer is made of.
  */
 guint
 gst_buffer_n_memory (GstBuffer * buffer)

gst/gstghostpad.c

@@ -819,7 +819,7 @@ gst_ghost_pad_get_target (GstGhostPad * gpad)
  * is unlinked and links to the new target are established. if @newtarget is
  * %NULL the target will be cleared.
  *
- * Returns: (transfer full): %TRUE if the new target could be set. This function
+ * Returns: %TRUE if the new target could be set. This function
  *     can return %FALSE when the internal pads could not be linked.
  */
 gboolean

libs/gst/check/gstharness.c

@@ -2016,10 +2016,6 @@ gst_harness_query_latency (GstHarness * h)
  *
  * Sets the min latency reported by #GstHarness when receiving a latency-query
  *
- * MT safe.
- *
- * Returns: a #GstClockTime with min latency
- *
  * Since: 1.6
  */
 void