chore: add docs for relay and urql network adapters

[alessbell]

A follow-on from #11301.

Checklist:

• If this PR contains changes to the library itself (not necessary for e.g. docs updates), please include a changeset (see CONTRIBUTING.md)
• If this PR is a new feature, please reference an issue where a consensus about the design was reached (not necessary for small changes)
• Make sure all of the significant new logic is covered by tests

[changeset-bot]

⚠️ No Changeset found

Latest commit: 03f577e

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[github-actions]

size-limit report 📦

Path	Size
dist/apollo-client.min.cjs	38.21 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs"	46 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs" (production)	43.55 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js"	33.97 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js" (production)	31.9 KB (0%)
import { ApolloProvider } from "dist/react/index.js"	1.24 KB (0%)
import { ApolloProvider } from "dist/react/index.js" (production)	1.22 KB (0%)
import { useQuery } from "dist/react/index.js"	5.2 KB (0%)
import { useQuery } from "dist/react/index.js" (production)	4.27 KB (0%)
import { useLazyQuery } from "dist/react/index.js"	5.51 KB (0%)
import { useLazyQuery } from "dist/react/index.js" (production)	4.58 KB (0%)
import { useMutation } from "dist/react/index.js"	3.51 KB (0%)
import { useMutation } from "dist/react/index.js" (production)	2.73 KB (0%)
import { useSubscription } from "dist/react/index.js"	3.19 KB (0%)
import { useSubscription } from "dist/react/index.js" (production)	2.39 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js"	5.28 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js" (production)	3.94 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js"	4.75 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js" (production)	3.39 KB (0%)
import { useLoadableQuery } from "dist/react/index.js"	4.96 KB (0%)
import { useLoadableQuery } from "dist/react/index.js" (production)	3.62 KB (0%)
import { useReadQuery } from "dist/react/index.js"	3.03 KB (0%)
import { useReadQuery } from "dist/react/index.js" (production)	2.97 KB (0%)
import { useFragment } from "dist/react/index.js"	2.1 KB (0%)
import { useFragment } from "dist/react/index.js" (production)	2.05 KB (0%)

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[jerelmiller]

Nice! Thanks for writing these up!