doc: resource key documentation for DA

[shemau]

Description

664 add some documentation for the DA for resource_keys variable which has a complex type

Release required?

• [ ] No release
• [x] Patch release (x.x.X)
• [ ] Minor release (x.X.x)
• [ ] Major release (X.x.x)

Release notes content

Improve variable documentation.

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• [ ] If relevant, a test for the change is included or updated with this PR.
• [ ] If relevant, documentation for the change is included or updated with this PR.

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[shemau]

/run pipeline

[shemau]

/run pipeline

[terraform-ibm-modules-ops]

:tada: This issue has been resolved in version 8.8.4 :tada:

The release is available on:

• GitHub release
• v8.8.4

Your semantic-release bot :package::rocket: