docs: change `sync-to-thread-info.rst` wording about `sync_to_thread` #4183

Job	Run time
mypy	2m 16s
pyright	1m 54s
slotscheck	1m 30s
Test Minimal Application with Base Dependencies	1m 20s
Test server integration (uvicorn<0.27.0)	1m 39s
Test server integration (uvicorn>=0.27.0)	1m 35s
Test Minimal Pydantic 1 application	1m 39s
test-platform-compat	0s
validate	17s
test (3.11) / test	2m 35s
test (3.10) / test	2m 52s
test (3.12) / test	4m 34s
test (3.9) / test	2m 57s
test (3.8) / test	3m 40s
build-docs	3m 36s
upload-test-coverage	16s
codeql	2m 59s
sonar	58s
	36m 37s

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