Merge branch 'dl/switch-c-option-in-error-message'

In error messages that "git switch" mentions its option to create a
new branch, "-b/-B" options were shown, where "-c/-C" options
should be, which has been corrected.

* dl/switch-c-option-in-error-message:
  switch: fix errors and comments related to -c and -C

diff --cc builtin/checkout.c
Simple merge