docs: Reflow docstring in client

[freya-docs]

Description:
This PR reflows the docstring in the Client.h file.

Related issue(s):

Fixes #1233

[github-actions]

Hey @freya-docs 👋 thanks for the PR!
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PR Checks

✅ DCO Sign-off -- All commits have valid sign-offs. Nice work!

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✅ Issue Link -- Linked to #1233 (assigned to you).

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[rwalworth]

LGTM — the reflow matches the 120-column limit perfectly and is consistent with surrounding docstrings. Running the workflows now and will merge once they pass!