Correct documentation - `terraform import rollbar_user.*` is to be done by email address, not user ID

[magnetikonline]

Description of the change

This fixes a problem in the documentation around importing existing Rollbar users into rollbar_user resources - import is not via user ID - but must be via email address.

Type of change

• [x] Bug fix (non-breaking change that fixes an issue)
• [ ] New feature (non-breaking change that adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Maintenance
• [ ] New release

Related issues

Fixes (part of) issues in:

• 224

• 235

Checklists

Development

• [x] Lint rules pass locally
• [ ] The code changed/added as part of this pull request has been covered with tests
• [ ] All tests related to the changed code pass in development

Code review

• [ ] This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• [ ] "Ready for review" label attached to the PR and reviewers assigned
• [ ] Issue from task tracker has a link to this pull request
• [ ] Changes have been reviewed by at least one other engineer

[coveralls]

Pull Request Test Coverage Report for Build 8842144592

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.097%

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Totals
Change from base Build 8449956416:	0.0%
Covered Lines:	1480
Relevant Lines:	1607

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💛 - Coveralls

[pawelsz-rb]

pipeline failed, we need to check the permissions, thank you for flagging, addressing in #396

[magnetikonline]

Thanks @pawelsz-rb 👍