docs(router): clarify stream_response semantics for Vertex rawPredict… #1829

Job	Run time
Resolve PR metadata	7s
build-supervisor / Resolve build plan	4s
build-gateway / Resolve build plan	4s
build-supervisor / Rust sandbox (arm64) / sandbox (arm64)	3m 27s
build-supervisor / Rust sandbox (amd64) / sandbox (amd64)	3m 13s
build-gateway / Rust gateway (arm64) / gateway (arm64)	6m 54s
build-gateway / Rust gateway (amd64) / gateway (amd64)	6m 36s
build-supervisor / Build supervisor (arm64)	1m 35s
build-supervisor / Build supervisor (amd64)	2m 18s
build-gateway / Build gateway (arm64)	1m 57s
build-gateway / Build gateway (amd64)	2m 24s
build-supervisor / Merge supervisor manifest	1m 22s
gpu-e2e	0s
GPU E2E result	-1s
build-gateway / Merge gateway manifest	2m 12s
kubernetes-e2e / Kubernetes E2E (Rust smoke)	9m 35s
e2e / E2E (rust-podman)	12m 56s
e2e / E2E (python)	7m 48s
e2e / E2E (rust-docker)	8m 5s
e2e / E2E (rust-podman-rootless)	13m 56s
kubernetes-ha-e2e	-1s
Kubernetes HA E2E result	0s
Core E2E result	3s
	1h 24m 34s

Provide feedback