Update suggested use for major update

[prsnbrg]

Fix #1091

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[phil-davis]

LGTM
It seems that the option and argument can actually be given either way around. But suggesting putting the option first makes it match with the help format:

$ php occ market:upgrade --help
Description:
  Installs new app versions if available on the marketplace

Usage:
  market:upgrade [options] [--] [<ids>...]

Arguments:
  ids                   Ids of the apps

Options:
  -l, --local[=LOCAL]   Optional path to a local app packages (multiple values allowed)
      --major           Allow update to a new major versions
...