samples: uuid: fix README issues

- use zephyr-app-commands
- fix bullet list formatting
- cross-reference UUID doxygen group

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>

samples/subsys/uuid/README.rst

@@ -6,10 +6,11 @@
 Overview
 ********
 
-This sample app demonstrates the use of the UUID utilities to generate and manipulate UUIDs
-accordingly to IETF RFC 9562.
+This sample app demonstrates the use of the :c:group:`uuid` utilities to generate and manipulate
+UUIDs accordingly to IETF RFC 9562.
 
 The following functionality is demonstrated:
+
 - UUIDv4 generation
 - UUIDv5 generation from namespace and data
 - UUID conversion from/to string and to base64 and base64 URL safe formats
@@ -18,6 +19,7 @@ Requirements
 ************
 
 This sample relies on the following modules:
+
 - MbedTLS for the UUIDv5 hash functions
 - Base64 for the base64 encoding of UUIDs
 - Entropy source for the pseudo-random generation of UUIDv4
@@ -26,11 +28,11 @@ Building and Running
 ********************
 
 Use the standard ``west`` commands to build and flash this application.
-For example for ``native_sim`` build with:
-```
-west build -p -b native_sim samples/subsys/uuid
-```
-Then run with:
-```
-west build -t run
-```
+For example, for ``native_sim``:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/subsys/uuid
+   :host-os: unix
+   :board: native_sim
+   :goals: run
+   :compact: