doc: Changed <B5> to u for python doc run
doc: Changed <B5> to u for python doc run

The µ character (<B5>) fails the python documentation run.
Replacing with 'u'.

Signed-off-by: Noel Eck <1e36ab6ededef40f3f16bdbc1b09eee72c5d08cf@intel.com>

spitfire88/upm,nitirohilla/upm,skiselev/upm,jontrulson/upm,whbruce/upm,skiselev/upm,Jon-ICS/upm,malikabhi05/upm,pylbert/upm,intel-iot-devkit/upm,malikabhi05/upm,pylbert/upm,g-vidal/upm,pylbert/upm,Propanu/upm,whbruce/upm,stefan-andritoiu/upm,skiselev/upm,Propanu/upm,pylbert/upm,Propanu/upm,jontrulson/upm,Jon-ICS/upm,skiselev/upm,whbruce/upm,intel-iot-devkit/upm,Propanu/upm,Propanu/upm,Jon-ICS/upm,skiselev/upm,malikabhi05/upm,jontrulson/upm,stefan-andritoiu/upm,malikabhi05/upm,stefan-andritoiu/upm,stefan-andritoiu/upm,Jon-ICS/upm,malikabhi05/upm,intel-iot-devkit/upm,sasmita/upm,stefan-andritoiu/upm,g-vidal/upm,nitirohilla/upm,malikabhi05/upm,pylbert/upm,jontrulson/upm,stefan-andritoiu/upm,pylbert/upm,jontrulson/upm,g-vidal/upm,intel-iot-devkit/upm,skiselev/upm,whbruce/upm,intel-iot-devkit/upm,nitirohilla/upm,spitfire88/upm,Propanu/upm,Jon-ICS/upm,intel-iot-devkit/upm,spitfire88/upm,g-vidal/upm,g-vidal/upm,sasmita/upm,sasmita/upm,sasmita/upm,whbruce/upm,spitfire88/upm,sasmita/upm,nitirohilla/upm,g-vidal/upm,spitfire88/upm,nitirohilla/upm