docs(sdk): Update render blocking status. (#835)

* docs(sdk): Update render blocking status.

Adds mention of new data on resource spans, see getsentry/sentry-javascript#7127

Author: k-fish

develop-docs/sdk/performance/span-data-conventions.mdx

@@ -19,11 +19,12 @@ Below describes the conventions for the Span interface for the `data` field on t
 
 ## Browser
 
-| Attribute           | Type   | Description                                | Examples              |
-| ------------------- | ------ | ------------------------------------------ | --------------------- |
-| `url`               | string | The URL of the resource that was fetched.  | `https://example.com` |
-| `method`            | string | The HTTP method used.                      | `GET`                 |
-| `type`              | string | The type of the resource that was fetched. | `xhr`                 |
-| `Encoded Body Size` | number | The encoded body size of the request.      | `123`                 |
-| `Decoded Body Size` | number | The decoded body size of the request.      | `456`                 |
-| `Transfer Size`     | number | The transfer size of the request.          | `789`                 |
+| Attribute                          | Type   | Description                                 | Examples              |
+| ---------------------------------- | ------ | ------------------------------------------- | --------------------- |
+| `url`                              | string | The URL of the resource that was fetched.   | `https://example.com` |
+| `method`                           | string | The HTTP method used.                       | `GET`                 |
+| `type`                             | string | The type of the resource that was fetched.  | `xhr`                 |
+| `Encoded Body Size`                | number | The encoded body size of the request.       | `123`                 |
+| `Decoded Body Size`                | number | The decoded body size of the request.       | `456`                 |
+| `Transfer Size`                    | number | The transfer size of the request.           | `789`                 |
+| `resource.render_blocking_status`  | string | The render blocking status of the resource. | `non-blocking`        |