docs: mark 4-bit RQ generally available as of v1.40

_includes/feature-notes/rq-4bit.mdx

@@ -1,5 +1,5 @@
-:::caution Preview — added in `v1.39.0`
+:::info Generally available as of `v1.40`
 
-**4-bit Rotational quantization (RQ)** for the **HNSW vector index** was added in **`v1.39.0`** as a preview feature. The API may change in future releases.
+**4-bit Rotational quantization (RQ)** for the **HNSW vector index** is generally available as of **`v1.40`**. It was introduced in **`v1.39`** as a preview.
 
 :::

docs/deploy/configuration/env-vars/index.md

@@ -36,7 +36,7 @@ import APITable from '@site/src/components/APITable';
 | `CORS_ALLOW_HEADERS` | Value of the `Access-Control-Allow-Headers` response header on the REST API, which controls the request headers a browser may send cross-origin. The default is the long list of headers Weaviate itself reads, including `Content-Type`, `Authorization` and the per-provider API-key headers. Default: the built-in header list | `string - comma separated names` | `Content-Type, Authorization` |
 | `CORS_ALLOW_METHODS` | Value of the `Access-Control-Allow-Methods` response header on the REST API, which controls the HTTP methods a browser may use cross-origin. Default: `*` | `string - comma separated names` | `GET, POST, OPTIONS` |
 | `CORS_ALLOW_ORIGIN` | Value of the `Access-Control-Allow-Origin` response header on the REST API, which controls the origins a browser may call Weaviate from. Set this to reach Weaviate directly from browser code on a specific site. Default: `*` | `string` | `https://example.com` |
-| `DEFAULT_QUANTIZATION` | Default quantization technique - can be overridden by the quantization method specified in the collection definition. Available values: `rq-8`, `rq-4`, `rq-1`, `pq`, `bq`, `sq` and `none`. Default: `none`.<br/><br/>Note: If the selected quantization method isn't supported for the index type of a collection (for example PQ & SQ aren't supported for the flat index, and `rq-4` is supported for the HNSW index only), the quantization won't be applied to that collection.<br/><br/>Added in `v1.33`. `rq-4` added in `v1.39` as a preview. | `string` | `rq-8` |
+| `DEFAULT_QUANTIZATION` | Default quantization technique - can be overridden by the quantization method specified in the collection definition. Available values: `rq-8`, `rq-4`, `rq-1`, `pq`, `bq`, `sq` and `none`. Default: `none`.<br/><br/>Note: If the selected quantization method isn't supported for the index type of a collection (for example PQ & SQ aren't supported for the flat index, and `rq-4` is supported for the HNSW index only), the quantization won't be applied to that collection.<br/><br/>Added in `v1.33`. `rq-4` generally available as of `v1.40`; introduced in `v1.39` as a preview. | `string` | `rq-8` |
 | `DEFAULT_SHARDING_COUNT` | Default `desiredCount` for new single-tenant collections, used when the collection definition does not specify one. An explicit `desiredCount` in the class creation request still takes precedence. A value of `0` (default) uses the cluster node count. Multi-tenant collections are unaffected. Must be `<= 512`. Runtime-configurable. Default: `0`<br/>Added in `v1.37` | `string - number` | `12` |
 | `DEFAULT_VECTOR_INDEX` | Default vector index type for new collections (and named vectors), used when the collection definition does not specify one. An explicit `vectorIndexType` in the collection definition still takes precedence. Available values: `hnsw`, `flat`, `dynamic`, and `hfresh`. Runtime-configurable. Default: `hnsw`<br/>Added in `v1.37.3` | `string` | `flat` |
 | `DEFAULT_VECTORIZER_MODULE` | Default vectorizer module - can be overridden by the vectorizer in the collection definition. | `string` | `text2vec-contextionary` |