Docs: Fixed enum and parameter links for network

Change-Id: Ie04e09d91e9b0781dc3bcbfe271c851fbe486849
Reviewed-by: David Schulz <david.schulz@digia.com>

src/network/access/qnetworkaccessmanager.cpp

@@ -347,7 +347,7 @@ static void ensureInitialized()
     \note To have the request not send credentials you must not call
     setUser() or setPassword() on the \a authenticator object. This
     will result in the \l finished() signal being emitted with a
-    \l QNetworkReply with error \l AuthenticationRequiredError.
+    \l QNetworkReply with error \l {QNetworkReply::} {AuthenticationRequiredError}.
 
     \note It is not possible to use a QueuedConnection to connect to
     this signal, as the connection will fail if the authenticator has

src/network/bearer/qnetworksession.cpp

@@ -235,10 +235,10 @@ QT_BEGIN_NAMESPACE
 */
 
 /*!
-    \fn void QNetworkSession::usagePoliciesChanged(UsagePolicies)
+    \fn void QNetworkSession::usagePoliciesChanged(QNetworkSession::UsagePolicies usagePolicies)
     \since 5.0
 
-    This signal is emitted when the \a UsagePolicies in force are changed by the system.
+    This signal is emitted when the \a usagePolicies in force are changed by the system.
 */
 
 /*!

src/network/bearer/qnetworksession.h

@@ -131,7 +131,7 @@ Q_SIGNALS:
     void error(QNetworkSession::SessionError);
     void preferredConfigurationChanged(const QNetworkConfiguration &config, bool isSeamless);
     void newConfigurationActivated();
-    void usagePoliciesChanged(QNetworkSession::UsagePolicies);
+    void usagePoliciesChanged(QNetworkSession::UsagePolicies usagePolicies);
 
 protected:
     virtual void connectNotify(const QMetaMethod &signal);