`multi_search_federated_1` code sample missing from most integrations

[ellnix]

There's a multi_search_federated_1 code sample:
Live website: https://www.meilisearch.com/docs/reference/api/multi_search#federated-multi-search
meilisearch-js: https://github.com/meilisearch/meilisearch-js/blob/489b58351c568e30a6c336d6e8bc9a603f17543d/.code-samples.meilisearch.yaml#L784

multi_search_federated_1: |-
  client.multiSearch({
    federation: {},
    queries: [
      {
        indexUid: 'movies',
        q: 'batman',
      },
      {
        indexUid: 'comics',
        q: 'batman',
      },
    ]
  })

It seems to be only implemented in js and php, likely because instructions to add it were missing from the issues created from #302 (see meilisearch/meilisearch-go#573 as a sample)

[curquiza]

Hello @ellnix
thanks for the report
I guess this is not the only code samples that is missing, we do our best but we have some misses sometimes
We have an internal tool to report all the missing code samples. I will try to run it when I will have more time, and I will open an issue with all missing code samples. In the meantime, I let this issue open 😉