[AI] [Agents] correct convenience doc string for Bing Grounding

[glharper]

Description

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[glharper]

@anushree1808 FYI

[Copilot]

Pull Request Overview

This PR corrects and enriches the convenience docstring for the BingGroundingTool initializer by replacing generic Custom Search references with accurate Bing Grounding descriptions and adding detailed parameter explanations.

• Updated the class docstring to reference “Bing Grounding” instead of “Bing Custom Search”
• Expanded each :param block with clearer descriptions and valid-value references

Comments suppressed due to low confidence (1)

sdk/ai/azure-ai-agents/azure/ai/agents/models/_patch.py:853

• The description refers to "tools allow" but the class is singular (BingGroundingTool); consider changing "tools allow only one connection" to "tool allows only one connection" for consistency.

:param connection_id: Connection ID used by tool. Bing Grounding tools allow only one connection.