docs: fix type annotation error and missing imports in function tools snippet

[Syed-Umer-Ali]

Why

Two content bugs in the human_in_the_loop.py snippet used by the Function Tools docs page:

1. Type error — reimburse() annotated -> str but returns {'status': 'ok'} (a dict). Type checkers will flag this.

2. Import error — from typing import Any and from google.adk.tools import LongRunningFunctionTool are placed above the [start:define_long_running_function] snippet tag. The docs site only renders lines inside the tag, so the code block shown to readers is missing these imports. Copy-pasting the example causes NameError.

Fix

• Changed -> str to -> dict[str, Any] on reimburse()
• Moved the two import lines inside the snippet region so they appear in the rendered code block

Verification

• The example is syntactically valid Python 3.10+
• Total change: +4/−3 lines in one file. No behavioral impact.

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[koverholt]

Good catch, thanks for contributing this fix. I verified the fixes against the latest ADK Python SDK/release and everything checks out. LGTM, merging!