[BUG] Missing information about env variables in documentation

[lechnerc77]

Is there an existing issue for this?

• I have searched the existing issues

What version of the Terraform provider are you using?

main-branch

What version of the Terraform CLI are you using?

1.7.3

What CF API version are you using?

3.153

What type of issue are you facing

documentation issue

Describe the bug

The documentation of the provider does not contain a description of the environment variables one could set for the provider configuration/authentication like CF_USER

Expected Behavior

The documentation contains the description that some parameters from the provider schema can be provided via environment parameters

Steps To Reproduce

n/a

Your Terraform Configuration

n/a

Roles

n/a

Add screenshots to help explain your problem

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Additional context

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