clarify the inspec check command

[chrisbirster]

Clarify the inspec check command because it does more than "Verify all tests at the specified path"

Description

Updates the cli document with more clarification of the inspec check command.

Related Issue

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• [x ] New content (non-breaking change)
• Breaking change (a content change which would break existing functionality or processes)

Checklist:

• [x ] I have read the CONTRIBUTING document.

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[chef-expeditor]

Hello chrisbirster! Thanks for the pull request!

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