Docs: fix link to `model_dump` #9918

Job	Run time
docs-build	2m 3s
test fastapi	1m 49s
lint 3.7	1m 4s
lint 3.8	1m 32s
lint 3.9	1m 35s
lint 3.10	1m 25s
lint 3.11	1m 9s
test ubuntu / 3.7	2m 1s
test ubuntu / 3.8	2m 36s
test ubuntu / 3.9	2m 29s
test ubuntu / 3.10	2m 57s
test ubuntu / 3.11	2m 39s
test macos / 3.7	4m 55s
test macos / 3.8	3m 13s
test macos / 3.9	3m 15s
test macos / 3.10	3m 17s
test macos / 3.11	5m 46s
test windows / 3.7	2m 52s
test windows / 3.8	5m 34s
test windows / 3.9	3m 14s
test windows / 3.10	3m 41s
test windows / 3.11	5m 20s
test ubuntu / pypy3.7	8m 25s
test ubuntu / pypy3.8	9m 31s
test ubuntu / pypy3.9	7m 57s
test memray	6m 2s
mypy 1.0.1 / 3.10	4m 43s
mypy lockfile / 3.10	3m 50s
mypy 1.2.0 / 3.10	5m 35s
mypy 1.4.1 / 3.10	3m 22s
mypy 1.5.1 / 3.10	3m 10s
mypy lockfile / 3.7	4m 14s
mypy lockfile / 3.8	4m 56s
mypy lockfile / 3.9	4m 16s
mypy lockfile / 3.11	4m 34s
test typing-extensions 4.6.1 on Python 3.8	2m 34s
test typing-extensions 4.6.1 on Python 3.9	2m 34s
test typing-extensions 4.6.1 on Python 3.10	2m 43s
test typing-extensions 4.6.1 on Python 3.11	2m 52s
test typing-extensions main on Python 3.8	3m 19s
test typing-extensions main on Python 3.9	2m 38s
test typing-extensions main on Python 3.10	2m 38s
test typing-extensions main on Python 3.11	2m 46s
test typing-extensions 4.6.1 on Python 3.7	1m 52s
check	2s
coverage-combine	50s
release	0s
Send tweet	0s
	2h 39m 49s

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