Classify public base classes as public APIs

Author: hugueskamba

drivers/internal/SerialBase.h renamed to drivers/SerialBase.h

@@ -34,7 +34,7 @@
 namespace mbed {
 /** \defgroup drivers */
 /** \ingroup drivers */
-/** \addtogroup drivers-internal-api Internal API */
+/** \addtogroup drivers-public-api */
 /** @{*/
 /**
  * \defgroup drivers_SerialBase SerialBase class

drivers/SerialWireOutput.h

@@ -26,7 +26,7 @@
 
 namespace mbed {
 /** \ingroup drivers */
-/** \addtogroup drivers-public-api */
+/** \addtogroup drivers-public-api Internal API */
 /** @{*/
 /**
  * \defgroup drivers_SerialWireOutput SerialWireOutput class

drivers/internal/TimerEvent.h renamed to drivers/TimerEvent.h

@@ -22,7 +22,7 @@
 
 namespace mbed {
 /** \ingroup drivers */
-/** \addtogroup drivers-internal-api Internal API */
+/** \addtogroup drivers-public-api */
 /** @{*/
 /**
  * \defgroup drivers_TimerEvent TimerEvent class