minor symfony#14236 Update http_client.rst : standalone HttpClient max host connections param (ybenhssaien)

This PR was submitted for the 5.1 branch but it was merged into the 4.4 branch instead.

Discussion
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Update http_client.rst : standalone HttpClient max host connections param

As the signature of `create` method : `public static function create(array $defaultOptions = [], int $maxHostConnections = 6, int $maxPendingPushes = 50): HttpClientInterface`

The max host connection should be passed as the second param to this method instead of an option.

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Commits
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70944d0 Update http_client.rst

Author: javiereguiluz

http_client.rst

@@ -197,10 +197,7 @@ The HTTP client also has one configuration option called
 
     .. code-block:: php-standalone
 
-        $client = HttpClient::create([
-            'max_host_connections' => 10,
-            // ...
-        ]);
+        $client = HttpClient::create([], 10);
 
 Scoping Client
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