Clarify required location of .d directories for each tool

[jonlives]

Description

The current documentation around the use of .d directories does not make it clear that different Chef tools require a specific directory name and will ignore any other .d directories not named correctly.

This PR clarifies the requirements of each tool.

Check List

• [X] Spell Check
• [X] Local build
• [X] Examine the local build
• [X] All tests pass

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[IanMadd]

See changes merged in #4283