minor #16246 Correct spelling & grammar in 4.4 http_client.rst (gnito-org)

This PR was merged into the 4.4 branch.

Discussion
----------

Correct spelling & grammar in 4.4 http_client.rst

<!--

If your pull request fixes a BUG, use the oldest maintained branch that contains
the bug (see https://symfony.com/releases for the list of maintained branches).

If your pull request documents a NEW FEATURE, use the same Symfony branch where
the feature was introduced (and `5.x` for features of unreleased versions).

-->

Commits
-------

2a68a27 Correct spelling & grammar in 4.4 http_client.rst

Author: javiereguiluz

http_client.rst

@@ -890,7 +890,7 @@ response sequentially instead of waiting for the entire response::
     ``php://temp`` stream. You can control this behavior by using the ``buffer``
     option: set it to ``true``/``false`` to enable/disable buffering, or to a
     closure that should return the same based on the response headers it receives
-    as argument.
+    as an argument.
 
 Canceling Responses
 ~~~~~~~~~~~~~~~~~~~
@@ -1064,7 +1064,7 @@ method will yield a special chunk whose ``isTimeout()`` will return ``true``::
 
     foreach ($client->stream($responses, 1.5) as $response => $chunk) {
         if ($chunk->isTimeout()) {
-            // $response staled for more than 1.5 seconds
+            // $response stale for more than 1.5 seconds
         }
     }