pulseaudio: Fixup name of the created pulseaudio sink

This was still mangled after the project rename. Also add a note to the
README that one needs to change the sink in pulseaudio manually.

README.md

@@ -4,6 +4,9 @@ The application will stream the selected monitor if the mutter screencast
 portal is available. If it is unavailable, a fallback to X11 based frame
 grabbing will happen. As such, it should work fine in almost all setups.
 
+To get audio streaming, you need to change the audio output in pulseaudio
+to use the created "Network-Displays" sink.
+
 To use it, you will need:
  * openh264 or x264
  * For audio supporting using AAC one of fdkaacenc, faac or avenc_aac
@@ -31,4 +34,4 @@ Appropriate video/audio encoders will be selected automatically. You can
 modify the choice by setting the NETWORK_DISPLAYS_H264_ENC and NETWORK_DISPLAYS_AAC_ENC
 environment variables and specifying the gstreamer element to use (if
 supported and detected). run with G_MESSAGES_DEBUG=all to see the selection
-at work during connection establishment.
\ No newline at end of file
+at work during connection establishment.

src/nd-pulseaudio.c

@@ -148,9 +148,9 @@ on_pa_nd_sink_got_info (pa_context         *c,
    * This means no screencast sink exist, and we need to create it. */
   self->operation = pa_context_load_module (self->context,
                                             "module-null-sink",
-                                            "sink_name=gnome_screencast "
+                                            "sink_name=gnome_network_displays "
                                             "rate=48000 "
-                                            "sink_properties=device.description=\"GNOME-Nd\""
+                                            "sink_properties=device.description=\"Network-Displays\""
                                             "device.class=\"sound\""
                                             "device.icon_name=\"network-wireless\"",
                                             on_pa_null_module_loaded,