docs(policy): fix guardrails docstring drift and temporal test-table row

[rhbelson]

Summary

Two documentation-correctness fixes in 01-features/07-centralize-and-govern-your-ai-infrastructure/02-policy, found while preparing the Diving Deep with AgentCore Workshop (v2). Both are docs/comment-only — no runtime behavior changes.

1. Guardrails in Policy — docstring/comment drift (02-guardrails-in-policy/deploy.py)

The ApplicationTool free-text field is named message in the actual tool schema, and all four guardrail policies scan context.input.message. But the module docstring, the create_application tool description, and an inline comment referred to a nonexistent customer_notes field. The docstring also listed the SSN policy as block_pii, while the code creates it as block_ssn. This aligns the docs with the code so a reader following the file isn't misled.

2. Temporal Policies — self-contradictory test-table row (03-temporal-policies/bankingassistant/README.md)

Policy 1's test table row 3 used three different account IDs for one case: the prompt said transfer to ACC-2003, the to_account column said ACC-9999, and the running example only ever looked up ACC-2002. The row still lands on DENY, but the mismatch makes the walkthrough incoherent. Fixed the prompt and column to agree on ACC-9999 and named the looked-up account (ACC-2002) in the DENY reason.

Note: I also reviewed the transfer_integrity_freshness policy's input.account_id: context.input.to_account binding — that is correct as written (the get_account_balance tool echoes its account_id argument in the response), so no change was made there.

Testing

Docs/comment-only changes; verified against the actual tool schema and guardrail policy code in deploy.py. No code paths altered.