Admin API docs: use consistent path param syntax (#19307) #2039

Job	Run time
Build and push image for linux/arm64	2m 44s
Build and push image for linux/amd64	3m 19s
Push merged images to docker.io/matrixdotorg/synapse	38s
Push merged images to oci-push.vpn.infra.element.io/synapse	41s
Push merged images to ghcr.io/element-hq/synapse	1m 4s
	8m 26s

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