docs: Fix or improve documentation in few places #4789

Job	Run time
slotscheck	20s
pyright	44s
mypy	1m 8s
Test server integration (uvicorn<0.27.0)	43s
Test Minimal Application with Base Dependencies	17s
Test server integration (uvicorn>=0.27.0)	44s
Test Minimal Pydantic 1 application	22s
test-platform-compat	0s
validate	23s
test (3.10) / test	1m 52s
test (3.11) / test	1m 53s
test (3.12) / test	2m 11s
test (3.13) / test	2m 10s
test (3.8) / test	2m 10s
test (3.9) / test	2m 1s
build-docs	2m 8s
upload-test-coverage	0s
sonar	0s
codeql	0s
	19m 6s

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