docs: sync Haystack API reference on Docusaurus (#12171)

Co-authored-by: anakin87 <44616784+anakin87@users.noreply.github.com>

Author: HaystackBot

docs-website/reference/haystack-api/cachings_api.md

@@ -112,3 +112,19 @@ Asynchronously checks if any document associated with the specified cache field
 - <code>dict\[str, Any\]</code> – A dictionary with two keys:
 - `hits` - Documents that matched with at least one of the items.
 - `misses` - Items that were not present in any documents.
+
+#### close
+
+```python
+close() -> None
+```
+
+Release the synchronous resources of the underlying Document Store.
+
+#### close_async
+
+```python
+close_async() -> None
+```
+
+Release the asynchronous resources of the underlying Document Store.

docs-website/reference/haystack-api/document_writers_api.md

@@ -127,3 +127,19 @@ but can be used with `await` in async code.
 
 - <code>ValueError</code> – If the specified document store is not found.
 - <code>TypeError</code> – If the specified document store does not implement `write_documents_async`.
+
+#### close
+
+```python
+close() -> None
+```
+
+Release the synchronous resources of the underlying Document Store.
+
+#### close_async
+
+```python
+close_async() -> None
+```
+
+Release the asynchronous resources of the underlying Document Store.

docs-website/reference/haystack-api/retrievers_api.md

@@ -140,6 +140,22 @@ continuing up the hierarchy until no more merges are possible.
 
 - <code>dict\[str, list\[Document\]\]</code> – List of documents (could be a mix of different hierarchy levels)
 
+#### close
+
+```python
+close() -> None
+```
+
+Release the synchronous resources of the underlying Document Store.
+
+#### close_async
+
+```python
+close_async() -> None
+```
+
+Release the asynchronous resources of the underlying Document Store.
+
 ## filter_retriever
 
 ### FilterRetriever
@@ -245,6 +261,22 @@ Asynchronously run the FilterRetriever on the given input data.
 
 - <code>dict\[str, Any\]</code> – A list of retrieved documents.
 
+#### close
+
+```python
+close() -> None
+```
+
+Release the synchronous resources of the underlying Document Store.
+
+#### close_async
+
+```python
+close_async() -> None
+```
+
+Release the asynchronous resources of the underlying Document Store.
+
 ## in_memory/bm25_retriever
 
 ### InMemoryBM25Retriever
@@ -1325,6 +1357,22 @@ document from the document store.
     document surrounding them. The documents are sorted by the `split_idx_start`
     meta field.
 
+#### close
+
+```python
+close() -> None
+```
+
+Release the synchronous resources of the underlying Document Store.
+
+#### close_async
+
+```python
+close_async() -> None
+```
+
+Release the asynchronous resources of the underlying Document Store.
+
 ## text_embedding_retriever
 
 ### TextEmbeddingRetriever