Improve language of user guide #2219

Job	Run time
format	53s
lint	52s
mypy (./packages/autogen-core)	2m 7s
mypy (./packages/autogen-magentic-one)	1m 14s
pyright (./packages/autogen-core)	56s
mypy (./packages/agbench)	53s
pyright (./packages/autogen-magentic-one)	1m 11s
pyright (./packages/agbench)	1m 6s
mypy (./packages/autogen-ext)	1m 47s
mypy (./packages/autogen-agentchat)	1m 14s
pyright (./packages/autogen-ext)	1m 1s
docs (./packages/autogen-core)	1m 33s
check-proto-changes-python	1m 7s
pyright (./packages/autogen-agentchat)	1m 4s
docs-example-check (./packages/autogen-core)	2m 3s
test (./packages/autogen-core)	59s
test (./packages/autogen-magentic-one)	1m 18s
test (./packages/autogen-ext)	2m 19s
test (./packages/autogen-agentchat)	57s
	24m 34s

Provide feedback