minor #20647 Update http client timeout option docs (Seldaek)

This PR was merged into the 6.4 branch.

Discussion
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Update http client timeout option docs

cc `@nicolas`-grekas

Commits
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3a70718 Update http client timeout option docs

Author: javiereguiluz

reference/configuration/framework.rst

@@ -1297,7 +1297,7 @@ timeout
 
 **type**: ``float`` **default**: depends on your PHP config
 
-Time, in seconds, to wait for a response. If the response takes longer, a
+Time, in seconds, to wait for network activity. If the connection is idle for longer, a
 :class:`Symfony\\Component\\HttpClient\\Exception\\TransportException` is thrown.
 Its default value is the same as the value of PHP's `default_socket_timeout`_
 config option.