[DOCS] Fix API Reference 404 links

[KOTungseth]

On the API Reference page, the following links result in a 404:

• Endpoint documentation link in client.inference.streamCompletion section

  • current link: https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-inference-stream-inference
  • change to: https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-inference-stream-completion

• Endpoint documentation link in client.transform.getNodeStats section

  • current link: https://www.elastic.co/guide/en/elasticsearch/reference/current/get-transform-node-stats.html
  • change to: https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-transform-get-transform-stats

[JoshMock]

@KOTungseth would it make sense to fix this in the spec (and probably the upstream JSON object in the Elasticsearch repo) to fix this, or is it a docs-specific tweak where it makes more sense to search/replace the URLs during code generation?