Fix versionadded

Author: Tiriel

http_client.rst

@@ -731,10 +731,11 @@ The ``RetryableHttpClient`` uses a
 decide if the request should be retried, and to define the waiting time between
 each retry.
 
-Retry over different uris
+Retry over different URIs
 .........................
 
 .. versionadded:: 6.3
+
     The multiple ``base_uri`` feature was added in Symfony 6.3.
 
 The ``RetryableHttpClient`` can be configured to use multiple base URIs. This
@@ -759,14 +760,13 @@ base URIs you want to shuffle in an additional array::
 
     $response = $client->request('GET', 'foo-bar', [
         'base_uri' => [
-            'http://example.com/a/',
             [
-                // one random URI from this list will be used on retry #2
+                // this array will be randomized
+                'http://example.com/a/',
                 'http://example.com/b/',
-                'http://example.com/c/',
             ],
             // non-nested base URIs are used in order
-            'http://example.com/d/',
+            'http://example.com/c/',
         ],
     ]);