doc: rename pipewire-devices.7 and move stream properties into it

Collect the list of object properties into a single place.

Group properties in the index based on the object type. Consider
"Monitor" as a separate object type, as it's generally configured
separately.

Add something about Port, Link, and Client properties. Just explain some
of these as they're fairly technical, so just link to API docs.

doc/dox/config/index.md

@@ -30,7 +30,7 @@ Configuration of daemons:
 Configuration of devices:
 
 - [WirePlumber configuration](https://pipewire.pages.freedesktop.org/wireplumber/daemon/configuration.html)
-- \ref page_man_pipewire-devices_7 "Device and node property reference"
+- \ref page_man_pipewire-props_7 "Object property reference"
 
 Configuration for client applications, either connecting via the
 native PipeWire interface, or the emulated ALSA, JACK, or PulseAudio
@@ -47,7 +47,7 @@ interfaces:
 - \subpage page_man_pipewire-pulse_conf_5
 - \subpage page_man_pipewire-jack_conf_5
 - \subpage page_man_pipewire-filter-chain_conf_5
-- \subpage page_man_pipewire-devices_7
+- \subpage page_man_pipewire-props_7
 - \subpage page_man_pipewire-pulse-modules_7
 - \subpage page_man_libpipewire-modules_7
 
@@ -77,6 +77,28 @@ interfaces:
 
 @SECREF@ pipewire-env client-env jack-env pulse-env
 
+**Object properties**
+
+@SECREF@ props
+
+**Monitor properties**
+
+@SECREF@ monitor-prop
+
 **Device properties**
 
-@SECREF@ device-param
+@SECREF@ device-prop
+
+**Node properties**
+
+@SECREF@ node-prop
+
+**Port properties**
+
+@SECREF@ port-prop
+
+**Client properties**
+
+@SECREF@ client-prop
+
+\see pw_keys in API documentation.