Updated documentation according to review suggestions

Author: Dean151

http_client.rst

@@ -150,15 +150,13 @@ brings most of the available options with type-hinted getters and setters::
     $this->client = $client->withOptions(
         (new HttpOptions())
             ->setBaseUri('https://...')
+            // Set headers replace *all* headers at once, and deletes the headers you do not provide
             ->setHeaders(['header-name' => 'header-value'])
+            // Alternatively, add or replace only one header to an existing HttpOptions object.
+            ->addHeader('another-header-name', 'another-header-value')
             ->toArray()
     );
 
-.. tip::
-
-    Be aware that calling :method:`Symfony\\Component\\HttpClient\\HttpOptions::setHeaders` overrides all previous headers.
-    If you intend to add or replace only one header, use :method:`Symfony\\Component\\HttpClient\\HttpOptions::addHeader` instead.
-
 .. versionadded:: 7.1
 
     The :method:`Symfony\\Component\\HttpClient\\HttpOptions::addHeader` method was introduced in Symfony 7.1.