[docs] correct stray "on by default" in docs and commands help (oclif)

[ZacharyEggert]

WHY are these changes introduced?

Fixes an error in the oclif output of the shopify commands command to match the expected cli behavior

WHAT is this pull request doing?

| config autocorrect status | ...On by default. |

becomes

| config autocorrect status | ...Off by default. |

How to test your changes?

• Build
• Run the shopify commands command
• View the config autocorrect section of the oclif generated table

Measuring impact

How do we know this change was effective? Please choose one:

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix
• Existing analytics will cater for this addition
• PR includes analytics changes to measure impact

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes

[ZacharyEggert]

I have signed the CLA!