Merge pull request #6884 from aabadie/fix_doxygen_brief

boards/airfy-beacon/include/board.h

boards/airfy-beacon/include/periph_conf.h

boards/arduino-atmega-common/include/board.h

boards/arduino-atmega-common/include/periph_conf.h

boards/arduino-due/include/arduino_pinmap.h

boards/arduino-due/include/sdcard_spi_params.h

boards/arduino-due/include/w5100_params.h

boards/arduino-zero/include/arduino_pinmap.h

boards/arduino-zero/include/board.h

boards/avsextrem/include/board.h

boards/avsextrem/include/periph_conf.h

boards/calliope-mini/include/board.h

boards/calliope-mini/include/periph_conf.h

boards/cc2538dk/include/board.h

boards/cc2650stk/include/board.h

boards/cc2650stk/include/periph_conf.h

boards/chronos/include/board.h

boards/chronos/include/periph_conf.h

boards/ek-lm4f120xl/include/board.h

boards/f4vi1/include/board.h