[TF Plugin Docs] - Edit data source template files -2

[sheneska]

Description

This PR edits the following template files:

• persistent_volume_claim.md.tmpl
• persistent_volume_claim_v1.md.tmpl
• persistent_volume_v1.md.tmpl
• pod.md.tmpl
• pod_v1.md.tmpl
• resource.md.tmpl
• resources.md.tmpl
• secret.md.tmpl
• secret_v1.md.tmpl
• service.md.tmpl
• service_account.md.tmpl
• service_account_v1.md.tmpl
• service_v1.md.tmpl
• storage_class.md.tmpl
• storage_class_v1.md.tmpl

Acceptance tests

• Have you added an acceptance test for the functionality being added?
• Have you run the acceptance tests on this branch?

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

Release Note

Release note for CHANGELOG:

...

References

Community Note

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