docs: format go snippet

[RomanMIzulin]

Description

Just format go snippet AND corrected a little bit to a be valid go code.

Type of change

• Documentation change (pure documentation change)

What's Changed

• go on failure code example

[vercel]

@RomanMIzulin is attempting to deploy a commit to the Hatchet Team on Vercel.

A member of the Team first needs to authorize it.

[steebchen]

Thanks @RomanMIzulin!

Unfortunately the linter ha issues with that specific snippe, I have no idea why.. it keeps wrongly intending it though so we can't merge this unless we also fix the underlying linter issue