[dajiaohuang]

Description

Correct four copyable examples in both the synchronous and asynchronous gRPC client docstrings:

• Use the existing max_grpc_message_length constructor keyword.
• Make the single query-string pair a tuple of pairs.
• Add the missing comma and remove the unsupported state argument in get_state.
• Quote the second key in get_bulk_state.

Only docstrings change; the executable ASTs of both files are unchanged.

Local validation on Python 3.13:

• Full prescribed unit command (pytest -m "not e2e" ./tests --ignore=tests/integration --ignore=tests/examples): 2172 passed, 41 deselected.
• Ruff lint: passed; format check: 538 files already formatted.
• MyPy with a fresh cache and its requested stubs installed: no issues in 230 source files.
• Eight temporary doc-contract checks (syntax, SDK signature binding, key literals, SDK query encoding): 0/8 before → 8/8 after. These checks do not instantiate clients or contact a sidecar. No permanent tests are added for this documentation-only correction.

Issue reference

No linked issue; this is a small correction to existing documentation examples, not an API or behavior change.

Checklist

• Code compiles correctly
• Created/updated tests
• Extended the documentation