Spelling fixes in comments and debug messages

Most of these errors were found by codespell:

controler -> controller
appropiate -> appropriate
devide -> divide
comming -> coming
seperate -> separate
reponsible -> responsible
initialization -> initialization
successfull -> successful
whithin -> within
recieve -> receive
wich -> which
occurence -> occurrence
beggining -> beginning
accessable -> accessible
proccess -> process
succesfuly -> successfully
immediatly -> immediately
prefered -> preferred
avaliable -> available
threshhold -> threshold
statistsics -> statistics
endianess -> endianness
positon -> position
writen -> written
occurence -> occurrence
upto -> up to
overwriten -> overwritten
availabe -> available
enviroment -> environment
intruction -> instruction
thru -> through
substract -> subtract
occured -> occurred
begining -> beginning
lenght -> length
atributes -> attributes
preceeding -> preceding
defintion -> definition
decriptor -> descriptor

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Grammar fix (sent -> send)

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Spelling fixes in forth code

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>