[gdb] Fix common misspellings

Fix the following common misspellings:
...
accidently -> accidentally
additonal -> additional
addresing -> addressing
adress -> address
agaisnt -> against
albiet -> albeit
arbitary -> arbitrary
artifical -> artificial
auxillary -> auxiliary
auxilliary -> auxiliary
bcak -> back
begining -> beginning
cannonical -> canonical
compatiblity -> compatibility
completetion -> completion
diferent -> different
emited -> emitted
emiting -> emitting
emmitted -> emitted
everytime -> every time
excercise -> exercise
existance -> existence
fucntion -> function
funtion -> function
guarentee -> guarantee
htis -> this
immediatly -> immediately
layed -> laid
noone -> no one
occurances -> occurrences
occured -> occurred
originaly -> originally
preceeded -> preceded
preceeds -> precedes
propogate -> propagate
publically -> publicly
refering -> referring
substract -> subtract
substracting -> subtracting
substraction -> subtraction
taht -> that
targetting -> targeting
teh -> the
thier -> their
thru -> through
transfered -> transferred
transfering -> transferring
upto -> up to
vincinity -> vicinity
whcih -> which
whereever -> wherever
wierd -> weird
withing -> within
writen -> written
wtih -> with
doesnt -> doesn't
...

Tested on x86_64-linux.

gdb/python/lib/gdb/disassembler.py

@@ -147,7 +147,7 @@ class maint_info_py_disassemblers_cmd(gdb.Command):
         # Figure out the name of the current architecture.  There
         # should always be a current inferior, but if, somehow, there
         # isn't, then leave curr_arch as the empty string, which will
-        # not then match agaisnt any architecture in the dictionary.
+        # not then match against any architecture in the dictionary.
         curr_arch = ""
         if gdb.selected_inferior() is not None:
             curr_arch = gdb.selected_inferior().architecture().name()