small nit on avalanche key transfer command

[meaghanfitzgerald]

Why this should be merged

When prompted for the sender address, the user currently sees this improper prompt:

? Which key source should be used to  for the sender address?:
  ▸ Use stored key
    Use ledger

How this works

Changes the phrasing and corrects spacing so that the user sees:

? Which key should be used as the sender address?:
  ▸ Use stored key
    Use ledger

How this was tested

avalanche key transfer

How is this documented

I am currently writing a doc on how to use this command: ava-labs/avalanche-docs#1910

[felipemadero]

can you use main as the base?

[meaghanfitzgerald]

used main as base branch #2226