docs(http): note that baseURL must be absolute in API Reference

One-liner clarification on the existing baseURL row of the
createHttpService API Reference table. The library-attributed error
message remains the primary documentation surface for the failure
path; this is the static-page corollary so consumers reading the API
table before writing the call site see the constraint up front.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Goosterhof

docs/packages/http.md

@@ -199,14 +199,14 @@ try {
 
 ### `createHttpService(baseURL, options?)`
 
-| Parameter                  | Type                     | Description                                                             |
-| -------------------------- | ------------------------ | ----------------------------------------------------------------------- |
-| `baseURL`                  | `string`                 | Base URL for all requests                                               |
-| `options.timeout`          | `number \| undefined`    | Request timeout in milliseconds (default: `30000`; pass `0` to disable) |
-| `options.headers`          | `Record<string, string>` | Default headers                                                         |
-| `options.withCredentials`  | `boolean`                | Send cookies cross-origin (default: `true`)                             |
-| `options.withXSRFToken`    | `boolean`                | Include XSRF token (default: `false`)                                   |
-| `options.smartCredentials` | `boolean`                | Auto-toggle credentials by origin (default: `false`)                    |
+| Parameter                  | Type                     | Description                                                                                                |
+| -------------------------- | ------------------------ | ---------------------------------------------------------------------------------------------------------- |
+| `baseURL`                  | `string`                 | Base URL for all requests. **Must be absolute** (e.g. `${location.origin}/api`); relative paths fail fast. |
+| `options.timeout`          | `number \| undefined`    | Request timeout in milliseconds (default: `30000`; pass `0` to disable)                                    |
+| `options.headers`          | `Record<string, string>` | Default headers                                                                                            |
+| `options.withCredentials`  | `boolean`                | Send cookies cross-origin (default: `true`)                                                                |
+| `options.withXSRFToken`    | `boolean`                | Include XSRF token (default: `false`)                                                                      |
+| `options.smartCredentials` | `boolean`                | Auto-toggle credentials by origin (default: `false`)                                                       |
 
 ### Constants