website/docs: Fix nginx proxy_pass directive documentation #21524

Job	Run time
lint (bandit)	1m 50s
lint (black)	2m 26s
lint (codespell)	1m 26s
lint (pending-migrations)	1m 40s
lint (ruff)	1m 38s
test-e2e (proxy)	4m 55s
test-integration	4m 55s
test-e2e (oauth)	6m 57s
test-e2e (oauth-oidc)	5m 20s
test-migrations	2m 16s
test-e2e (saml)	5m 18s
test-migrations-from-stable - PostgreSQL 15-alpine	17m 30s
test-e2e (ldap)	8m 23s
test-migrations-from-stable - PostgreSQL 16-alpine	15m 45s
test-unittest - PostgreSQL 15-alpine	14m 52s
test-e2e (radius)	4m 21s
test-unittest - PostgreSQL 16-alpine	14m 32s
test-e2e (scim)	3m 31s
test-e2e (flows)	5m 23s
ci-core-mark	1s
build (amd64)	6m 16s
build (arm64)	16m 14s
pr-comment	0s
	2h 25m 29s

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