Fix SupbaseVectoreStore write operation timeout (#12318)

**Description**
This small change will make chunk_size a configurable parameter for
loading documents into a Supabase database.

**Issue**
https://github.com/langchain-ai/langchain/issues/11422

**Dependencies**
No chanages

**Twitter**
@ j1philli

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---------

Co-authored-by: Greg Richardson <greg.nmr@gmail.com>

docs/docs/integrations/vectorstores/supabase.ipynb

@@ -197,7 +197,7 @@
    "id": "5abb9b93",
    "metadata": {},
    "source": [
-    "Insert the above documents into the database. Embeddings will automatically be generated for each document."
+    "Insert the above documents into the database. Embeddings will automatically be generated for each document. You can adjust the chunk_size based on the amount of documents you have. The default is 500 but lowering it may be necessary."
    ]
   },
   {
@@ -208,7 +208,7 @@
    "outputs": [],
    "source": [
     "\n",
-    "vector_store = SupabaseVectorStore.from_documents(docs, embeddings, client=supabase, table_name=\"documents\", query_name=\"match_documents\")"
+    "vector_store = SupabaseVectorStore.from_documents(docs, embeddings, client=supabase, table_name=\"documents\", query_name=\"match_documents\", chunk_size=500)"
    ]
   },
   {