Minor release notes rewording. (#3726)

* Minor release notes rewording.

Signed-off-by: Maiero <matteo.maiero@eurotech.com>

* Updated raspbian to Raspberry Pi OS

Signed-off-by: Maiero <matteo.maiero@eurotech.com>

* Mentioned Buster explicitly for rpi

Signed-off-by: Nicola Timeus <nicola.timeus@eurotech.com>

Co-authored-by: Nicola Timeus <nicola.timeus@eurotech.com>

kura/distrib/RELEASE_NOTES.txt

@@ -3,7 +3,8 @@ Eclipse Kura - 4.1.3   - December 2021
 Description:
 Eclipse Kura 4.1.3 is a service release to address various CVEs in framework dependencies.
 In particular, the release addressed CVE-2021-44228, CVE-2021-45046 and CVE-2021-45105 
-by updating Log4J to version 2.17.0, Google Protobuf to 3.8.0 and Jetty to version 9.4.41.
+by updating Log4J to version 2.17.0. Further platform updates are for Google Protobuf to 3.8.0 
+and Jetty to version 9.4.41.
 
 
 Changes:
@@ -27,7 +28,7 @@ Compatibility:
 
 Target Environments:
   * Kura is released as pre-compiled binary installers for the following platforms:
-    * Raspberry Pi 2/3 based on Raspbian
+    * Raspberry Pi 2/3 based on Raspberry Pi OS Buster (32 bits)
     * Intel Up Squared board running Ubuntu 18  
     * Intel Up Squared board running Centos 7 (Experimental)
     * Rock960 ARM_64 running Ubuntu 16 (NN version only)