fix(docs): exec block syntax

[vchiranjeeviak]

Docs currently container exec = {}, but the latest kubernetes terraform provider documentation shows it should be exec {}.

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

Acceptance tests

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Release Note

Release note for CHANGELOG:

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References

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