Wrong command syntax '--sort-by-required'

[chakatz]

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I'm a first-time user, but it seems to me that --sort-by-required should be --sort-by required It is wrong in several places in the readme.

https://github.com/cytopia/docker-terraform-docs/blob/master/README.md

I ran the command below to figure out the proper syntax docker run --rm -v $(pwd):/data cytopia/terraform-docs terraform-docs help