docs: update `usage/channels` #4649

Job	Run time
mypy	1m 6s
pyright	37s
slotscheck	17s
Test server integration (uvicorn<0.27.0)	36s
Test Minimal Application with Base Dependencies	17s
Test server integration (uvicorn>=0.27.0)	40s
Test Minimal Pydantic 1 application	17s
test-platform-compat	0s
validate	20s
test (3.10) / test	1m 59s
test (3.11) / test	1m 44s
test (3.12) / test	2m 58s
test (3.13) / test	2m 2s
test (3.8) / test	2m 48s
test (3.9) / test	1m 54s
build-docs	2m 13s
upload-test-coverage	19s
codeql	1m 52s
sonar	1m 0s
	22m 59s

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