docs(client): Update setFeeGranter and setFeePayer comments (backport #22526)

[mergify]

Description

Closes: #18886

See: #22311

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Summary by CodeRabbit

• New Features
  • Introduced methods to specify the fee payer and fee granter for transactions, enhancing fee management capabilities.

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This is an automatic backport of pull request #22526 done by [Mergify](https://mergify.com).

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