Fix documentation for QNetworkReply::redirected

In d12afeff40, the default redirect policy was
changed to NoLessSafeRedirectPolicy (from ManualRedirectPolicy), and this was
reworded from:

    This signal is emitted if the QNetworkRequest::FollowRedirectsAttribute was
    set in the request [...]

(i.e.: Qt handles redirect, no manual handling) to:

    This signal is emitted if the QNetworkRequest::ManualRedirectPolicy was
    set in the request [...]

(i.e.: User handles redirect, no handling by Qt), which is exactly the wrong way
around. Only if Qt handles the redirect, it's able to send a signal about it.
If the user handles redirects, they would get the RedirectionTargetAttribute in
response to the finished() signal.

Also see tst_QNetworkReply::ioHttpSingleRedirect(): It sets
NoLessSafeRedirectPolicy (default since Qt 6) and then ensures the "redirected"
signal has been emitted.

Pick-to: 6.3 6.2
Change-Id: I7e80ff69b94a4d94eb541b1021b05601d183c733
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

src/network/access/qnetworkreply.cpp

@@ -300,7 +300,7 @@ QNetworkReplyPrivate::QNetworkReplyPrivate()
     \fn void QNetworkReply::redirected(const QUrl &url)
     \since 5.6
 
-    This signal is emitted if the QNetworkRequest::ManualRedirectPolicy was
+    This signal is emitted if the QNetworkRequest::ManualRedirectPolicy was not
     set in the request and the server responded with a 3xx status (specifically
     301, 302, 303, 305, 307 or 308 status code) with a valid url in the location
     header, indicating a HTTP redirect. The \a url parameter contains the new

src/network/access/qnetworkrequest.cpp

@@ -174,10 +174,10 @@ QT_IMPL_METATYPE_EXTERN_TAGGED(QNetworkRequest::RedirectPolicy, QNetworkRequest_
         Replies only, type: QMetaType::QUrl (no default)
         If present, it indicates that the server is redirecting the
         request to a different URL. The Network Access API does follow
-        redirections by default, but if
-        QNetworkRequest::ManualRedirectPolicy is enabled and
-        the redirect was not handled in redirected() then this
-        attribute will be present.
+        redirections by default, unless
+        QNetworkRequest::ManualRedirectPolicy is used. Additionally, if
+        QNetworkRequest::UserVerifiedRedirectPolicy is used, then this
+        attribute will be set if the redirect was not followed.
         The returned URL might be relative. Use QUrl::resolved()
         to create an absolute URL out of it.