docs: enhance agents.ipynb with parallel tool calls section #3592

Job	Run time
format	55s
lint	53s
mypy (./packages/autogen-core)	2m 27s
mypy (./packages/autogen-magentic-one)	1m 18s
pyright (./packages/autogen-core)	1m 7s
mypy (./packages/agbench)	1m 5s
pyright (./packages/autogen-magentic-one)	1m 3s
mypy (./packages/autogen-ext)	2m 1s
pyright (./packages/agbench)	1m 4s
mypy (./packages/autogen-agentchat)	1m 30s
pyright (./packages/autogen-ext)	1m 46s
mypy (./packages/magentic-one-cli)	1m 27s
pyright (./packages/autogen-agentchat)	56s
pyright (./packages/magentic-one-cli)	55s
check-proto-changes-python	1m 18s
codecov (./packages/autogen-core)	1m 2s
codecov (./packages/autogen-magentic-one)	2m 5s
docs (./packages/autogen-core)	1m 30s
codecov (./packages/autogen-ext)	3m 4s
docs-example-check (./packages/autogen-core)	2m 53s
codecov (./packages/autogen-agentchat)	1m 10s
markdown-code-lint	2m 17s
samples-code-check	54s
test (./packages/autogen-core)	1m 1s
test (./packages/autogen-magentic-one)	1m 26s
test (./packages/autogen-ext)	3m 25s
test (./packages/autogen-agentchat)	1m 14s
	41m 46s

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