docs: sync Haystack API reference on Docusaurus (#12096)

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

Author: HaystackBot

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

@@ -955,14 +955,21 @@ read(reference: str) -> str
 
 Read back the content previously written to `reference`.
 
+The resolved reference must stay within the store root: callers must treat it as an opaque
+store-scoped reference, not as an arbitrary filesystem path.
+
 **Parameters:**
 
-- **reference** (<code>str</code>) – A path returned by `write`.
+- **reference** (<code>str</code>) – A store reference returned by `write`.
 
 **Returns:**
 
 - <code>str</code> – The stored content.
 
+**Raises:**
+
+- <code>ValueError</code> – If `reference` resolves to a location outside the store root.
+
 #### to_dict
 
 ```python