feat: documentation for response body expressions#110

SkArchon merged 2 commits intomainwundergraph/cosmo-docs:mainfrom

milinda/eng-7440-allow-to-log-response-payload-of-router-and-subgraph-viawundergraph/cosmo-docs:milinda/eng-7440-allow-to-log-response-payload-of-router-and-subgraph-viaCopy head branch name to clipboard