tcp: fix markup for example pipelines in docs

gtk-doc doesn't like the # it seems.

https://bugzilla.gnome.org/show_bug.cgi?id=795548

gst/tcp/gsttcpclientsink.c

@@ -25,11 +25,12 @@
  * @title: tcpclientsink
  * @see_also: #tcpclientsink
  *
- * ## Example launch line
+ * ## Example launch line (server):
  * |[
- * # server:
  * nc -l -p 3000
- * # client:
+ * ]|
+ * ## Example launch line (client):
+ * |[
  * gst-launch-1.0 fdsink fd=1 ! tcpclientsink port=3000
  * ]|
  *  everything you type in the client is shown on the server (fd=1 means

gst/tcp/gsttcpclientsrc.c

@@ -25,11 +25,12 @@
  * @title: tcpclientsrc
  * @see_also: #tcpclientsink
  *
- * ## Example launch line
+ * ## Example launch line (server):
  * |[
- * # server:
  * nc -l -p 3000
- * # client:
+ * ]|
+ * ## Example launch line (client):
+ * |[
  * gst-launch-1.0 tcpclientsrc port=3000 ! fdsink fd=2
  * ]|
  *  everything you type in the server is shown on the client.

gst/tcp/gsttcpserversink.c

@@ -23,11 +23,12 @@
  * @title: tcpserversink
  * @see_also: #multifdsink
  *
- * ## Example launch line
+ * ## Example launch line (server):
  * |[
- * # server:
  * gst-launch-1.0 fdsrc fd=1 ! tcpserversink port=3000
- * # client:
+ * ]|
+ * ## Example launch line (client):
+ * |[
  * gst-launch-1.0 tcpclientsrc port=3000 ! fdsink fd=2
  * ]|
  *

gst/tcp/gsttcpserversrc.c

@@ -25,11 +25,12 @@
  * @title: tcpserversrc
  * @see_also: #tcpserversink
  *
- * ## Example launch line
+ * ## Example launch line (server):
  * |[
- * # server:
  * gst-launch-1.0 tcpserversrc port=3000 ! fdsink fd=2
- * # client:
+ * ]|
+ * ## Example launch line (client):
+ * |[
  * gst-launch-1.0 fdsrc fd=1 ! tcpclientsink port=3000
  * ]|
  *