addons: Spelling fixes

Correct typos of the following word families:

definition
listener
fastcopy
logical
registration
classify
documentation
explicitly
dialed
endpoint
elements
arithmetic
might
prepend
byte
terminal
inquiry
skipping
aliases
calling
absent
authentication
transmit
their
ericsson
disconnecting
redir
items
client
adapter
transmitter
existing
satisfies
pointer
interval
supplied

ASTERISK-29714

Change-Id: I8548438246f7b718d88e0b9e0a1eb384bbec88e4