docs: update API references (#502)

.changeset/late-paws-help.md

apps/docs/docs/modules/chat_engine.md

apps/docs/docs/modules/data_index.md

apps/docs/docs/modules/data_loader.md

apps/docs/docs/modules/documents_and_nodes/index.md

apps/docs/docs/modules/embedding.md

apps/docs/docs/modules/ingestion_pipeline/transformations.md

apps/docs/docs/modules/llm.md

apps/docs/docs/modules/node_parser.md

apps/docs/docs/modules/query_engines/index.md

apps/docs/docs/modules/response_synthesizer.md

apps/docs/docs/modules/retriever.md

apps/docs/docs/modules/storage.md