Fix pydantic-settings to underscore in docs #9916

Job	Run time
docs-build	2m 4s
lint 3.7	1m 6s
lint 3.8	1m 11s
lint 3.9	1m 28s
lint 3.10	1m 6s
lint 3.11	1m 28s
test fastapi	1m 46s
test ubuntu / 3.7	2m 37s
test ubuntu / 3.8	2m 10s
test ubuntu / 3.9	2m 7s
test ubuntu / 3.10	2m 17s
test ubuntu / 3.11	3m 19s
test macos / 3.7	3m 13s
test macos / 3.8	4m 2s
test macos / 3.9	3m 8s
test macos / 3.10	5m 58s
test macos / 3.11	3m 34s
test windows / 3.7	4m 0s
test windows / 3.8	4m 17s
test windows / 3.9	4m 48s
test windows / 3.10	4m 51s
test windows / 3.11	5m 3s
test ubuntu / pypy3.7	12m 52s
test ubuntu / pypy3.8	7m 49s
test ubuntu / pypy3.9	12m 0s
test memray	5m 21s
mypy 1.0.1 / 3.10	4m 37s
mypy lockfile / 3.10	3m 33s
mypy 1.2.0 / 3.10	4m 23s
mypy 1.4.1 / 3.10	3m 7s
mypy 1.5.1 / 3.10	3m 57s
mypy lockfile / 3.7	4m 19s
mypy lockfile / 3.8	3m 19s
mypy lockfile / 3.9	4m 8s
mypy lockfile / 3.11	4m 1s
test typing-extensions 4.6.1 on Python 3.8	2m 39s
test typing-extensions 4.6.1 on Python 3.9	3m 39s
test typing-extensions 4.6.1 on Python 3.10	2m 45s
test typing-extensions 4.6.1 on Python 3.11	2m 58s
test typing-extensions main on Python 3.8	3m 10s
test typing-extensions main on Python 3.9	3m 44s
test typing-extensions main on Python 3.10	3m 7s
test typing-extensions main on Python 3.11	2m 53s
test typing-extensions 4.6.1 on Python 3.7	1m 31s
coverage-combine	28s
check	2s
release	0s
Send tweet	0s
	2h 45m 55s

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