community[patch]: docarray requires hnsw installation (#19416)

I have a small dataset, and I tried to use docarray:
``DocArrayHnswSearch ``. But when I execute, it returns:

```bash
    raise ImportError(
ImportError: Could not import docarray python package. Please install it with `pip install "langchain[docarray]"`.
```

Instead of docarray it needs to be 

```bash
docarray[hnswlib]
```

Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>

libs/community/langchain_community/vectorstores/docarray/hnsw.py

@@ -14,7 +14,7 @@ class DocArrayHnswSearch(DocArrayIndex):
     """`HnswLib` storage using `DocArray` package.
 
     To use it, you should have the ``docarray`` package with version >=0.32.0 installed.
-    You can install it with `pip install "langchain[docarray]"`.
+    You can install it with `pip install "docarray[hnswlib]"`.
     """
 
     @classmethod