Fix typo: missing dash for --offline in help

[jindraj]

Name of feature:

N/A

Pain or issue this feature alleviates:

N/A

Why is this important to the project (if not answered above):

it's not important, just cosmetic

Is there documentation on how to use this feature? If so, where?

N/A

In what environments or workflows is this feature supported?

N/A

In what environments or workflows is this feature explicitly NOT supported (if any)?

N/A

Supporting links/other PRs/issues:

N/A 💔Thank you!

[CLAassistant]

All committers have signed the CLA.

[hslatman]

Thank you, @jindraj 😄