Update documentation list[messages]

[priyansh4320]

depends on #2081

Why are these changes needed?

documentation and notebook updates for PR 2081

Related issue number

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• [x] I've included any doc changes needed for https://docs.ag2.ai/. See https://docs.ag2.ai/latest/docs/contributor-guide/documentation/ to build and test documentation locally.
• [x] I've added tests (if relevant) corresponding to the changes introduced in this PR.
• [x] I've made sure all auto checks have passed.

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[joggrbot[bot]]

📝 Documentation Analysis

All docs are up to date! 🎉

---

✅ Latest commit analyzed: 3dcdca02b6f66445fb1534353bebd3bfbc19c785 | Powered by Joggr

[codecov[bot]]

Codecov Report

:x: Patch coverage is 53.73134% with 31 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
autogen/agentchat/conversable_agent.py	53.96%	14 Missing and 15 partials :warning:
...ents/experimental/document_agent/document_agent.py	0.00%	1 Missing :warning:
autogen/tools/tool.py	50.00%	0 Missing and 1 partial :warning:

Files with missing lines	Coverage Δ
autogen/agentchat/agent.py	100.00% <ø> (ø)
autogen/agentchat/group/multi_agent_chat.py	30.76% <ø> (ø)
autogen/agentchat/group/patterns/random.py	100.00% <100.00%> (ø)
autogen/agentchat/groupchat.py	66.48% <ø> (-4.13%)	:arrow_down:
.../tools/experimental/deep_research/deep_research.py	44.32% <ø> (-7.22%)	:arrow_down:
...ents/experimental/document_agent/document_agent.py	21.07% <0.00%> (ø)
autogen/tools/tool.py	91.80% <50.00%> (-1.42%)	:arrow_down:
autogen/agentchat/conversable_agent.py	61.68% <53.96%> (-2.42%)	:arrow_down:

... and 38 files with indirect coverage changes

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