doc: fix most occurences of FU as an author

boards/avsextrem/board_init.c

boards/avsextrem/drivers/avsextrem-cc1100.c

boards/avsextrem/drivers/avsextrem-smb380.c

boards/avsextrem/drivers/avsextrem-ssp0.c

boards/avsextrem/include/board.h

boards/avsextrem/include/configure.h

boards/avsextrem/include/smb380-board.h

boards/avsextrem/include/ssp0-board.h

boards/msba2-common/board_common_init.c

boards/msba2-common/drivers/msba2-ltc4150.c

boards/msba2-common/drivers/msba2-uart0.c

boards/msba2-common/include/msba2_common.h

boards/msba2/board_init.c

boards/msba2/msba2-cc110x.c

boards/pttu/include/board.h

boards/wsn430-v1_3b/include/board.h

boards/wsn430-v1_4/include/board.h

core/cib.c

core/include/atomic.h

core/include/attributes.h