rtp: Fix documentation and comments to use rtpbin instead of old gstrtpbin

https://bugzilla.gnome.org/show_bug.cgi?id=703426

gst/rtp/README

@@ -343,7 +343,7 @@ Some gst-launch-1.0 lines:
  
  Even when sync is enabled, the two different streams will not play synchronised
  against eachother because the receiver does not have enough information to
- perform this task. For this you need to add the gstrtpbin element in both the
+ perform this task. For this you need to add the rtpbin element in both the
  sender and receiver pipeline and use additional sources and sinks to transmit
  RTCP packets used for inter-stream synchronisation.
 

gst/rtpmanager/gstrtpbin.c

@@ -18,8 +18,8 @@
  */
 
 /**
- * SECTION:element-gstrtpbin
- * @see_also: gstrtpjitterbuffer, gstrtpsession, gstrtpptdemux, gstrtpssrcdemux
+ * SECTION:element-rtpbin
+ * @see_also: rtpjitterbuffer, rtpsession, rtpptdemux, rtpssrcdemux
  *
  * RTP bin combines the functions of #GstRtpSession, #GstRtpSsrcDemux,
  * #GstRtpJitterBuffer and #GstRtpPtDemux in one element. It allows for multiple
@@ -36,7 +36,7 @@
  * the packets are released from the jitterbuffer, they will be forwarded to a
  * #GstRtpPtDemux element. The #GstRtpPtDemux element will demux the packets based
  * on the payload type and will create a unique pad recv_rtp_src_\%u_\%u_\%u on
- * gstrtpbin with the session number, SSRC and payload type respectively as the pad
+ * rtpbin with the session number, SSRC and payload type respectively as the pad
  * name.
  *
  * To also use #GstRtpBin as an RTCP receiver, request a recv_rtcp_sink_\%u pad. The
@@ -58,7 +58,7 @@
  * mapping. One can clear the cached values with the #GstRtpSession::clear-pt-map
  * signal.
  *
- * Access to the internal statistics of gstrtpbin is provided with the
+ * Access to the internal statistics of rtpbin is provided with the
  * get-internal-session property. This action signal gives access to the
  * RTPSession object which further provides action signals to retrieve the
  * internal source and other sources.
@@ -67,10 +67,10 @@
  * <title>Example pipelines</title>
  * |[
  * gst-launch-1.0 udpsrc port=5000 caps="application/x-rtp, ..." ! .recv_rtp_sink_0 \
- *     gstrtpbin ! rtptheoradepay ! theoradec ! xvimagesink
- * ]| Receive RTP data from port 5000 and send to the session 0 in gstrtpbin.
+ *     rtpbin ! rtptheoradepay ! theoradec ! xvimagesink
+ * ]| Receive RTP data from port 5000 and send to the session 0 in rtpbin.
  * |[
- * gst-launch-1.0 gstrtpbin name=rtpbin \
+ * gst-launch-1.0 rtpbin name=rtpbin \
  *         v4l2src ! videoconvert ! ffenc_h263 ! rtph263ppay ! rtpbin.send_rtp_sink_0 \
  *                   rtpbin.send_rtp_src_0 ! udpsink port=5000                            \
  *                   rtpbin.send_rtcp_src_0 ! udpsink port=5001 sync=false async=false    \
@@ -89,7 +89,7 @@
  * as soon as possible and do not participate in preroll, sync=false and
  * async=false is configured on udpsink
  * |[
- * gst-launch-1.0 -v gstrtpbin name=rtpbin                                          \
+ * gst-launch-1.0 -v rtpbin name=rtpbin                                          \
  *     udpsrc caps="application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H263-1998" \
  *             port=5000 ! rtpbin.recv_rtp_sink_0                                \
  *         rtpbin. ! rtph263pdepay ! ffdec_h263 ! xvimagesink                    \