lib: readme: Add stm32wb0 and stm32wba

Edit the path and the description of stm32wb.
Add stm32wb0 and stm32wba libraries' descriptions.

Signed-off-by: Nidhal BEN OTHMEN <[email protected]>

Author: benothmn-st

lib/README

@@ -1,7 +1,11 @@
 
 Directory contains all the official libraries provided by STMicroelectronics.
 
-Available libs:
-  * stm32wb/hci:
-      Middleware for interprocessor communication on stm32wb dual core SoC
-  * ...
+Available libraries:
+  * stm32wb:
+      Middleware for interprocessor communication that enables BLE HCI communication between
+      the host core and the controller core of the STM32WB.
+  * stm32wb0:
+      STM32WB0 BLE controller interfacing library.
+  * stm32wba:
+      STM32WBA BLE controller interfacing library.