Add client close statements to Hyperdrive examples

[ReppCodes]

These had been removed previously, but should be added back now that it is safe to do so.

Summary

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Documentation checklist

• [ ] The documentation style guide has been adhered to.
• [ ] If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• [ ] Files which have changed name or location have been allocated redirects.