Note the introductory version of network redirection related enums.

These were missed in d815de8c26 which
originally added these values.

Change-Id: I69618c90e71f7cc01eef3db477427759e62f626b
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@theqtcompany.com>
Reviewed-by: Mandeep Sandhu <mandeepsandhu.chd@gmail.com>

src/network/access/qnetworkreply.cpp

@@ -135,10 +135,12 @@ QNetworkReplyPrivate::QNetworkReplyPrivate()
     \value TooManyRedirectsError       while following redirects, the maximum
     limit was reached. The limit is by default set to 50 or as set by
     QNetworkRequest::setMaxRedirectsAllowed().
+    (This value was introduced in 5.6.)
 
     \value InsecureRedirectError       while following redirects, the network
     access API detected a redirect from a encrypted protocol (https) to an
     unencrypted one (http).
+    (This value was introduced in 5.6.)
 
     \value ProxyConnectionRefusedError the connection to the proxy
     server was refused (the proxy server is not accepting requests)

src/network/access/qnetworkrequest.cpp

@@ -263,6 +263,7 @@ QT_BEGIN_NAMESPACE
         Indicates whether the Network Access API should automatically follow a
         HTTP redirect response or not. Currently redirects that are insecure,
         that is redirecting from "https" to "http" protocol, are not allowed.
+        (This value was introduced in 5.6.)
 
     \value User
         Special type. Additional information can be passed in