doc: Add more missing return types to \fn commands

Added missing return types to \fn commands and removed
some unnecessary \internal comments.

Change-Id: Ie6691f83a1c510134d1e83c3d98758360a67217e
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

src/network/kernel/qhostaddress.cpp

@@ -1233,7 +1233,7 @@ bool QHostAddress::isGlobal() const
     \l{https://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml}{IANA
     IPv6 Address Space} registry for more information.
 
-    \sa isLoopback(), isGlobal(). isMulticast(), isSiteLocal(), isUniqueLocalUnicast()
+    \sa isLoopback(), isGlobal(), isMulticast(), isSiteLocal(), isUniqueLocalUnicast()
 */
 bool QHostAddress::isLinkLocal() const
 {
@@ -1338,8 +1338,8 @@ uint qHash(const QHostAddress &key, uint seed) Q_DECL_NOTHROW
 }
 
 /*!
+    \fn bool operator==(QHostAddress::SpecialAddress lhs, const QHostAddress &rhs)
     \relates QHostAddress
-    \fn operator==(QHostAddress::SpecialAddress lhs, const QHostAddress &rhs)
 
     Returns \c true if special address \a lhs is the same as host address \a rhs;
     otherwise returns \c false.
@@ -1348,9 +1348,9 @@ uint qHash(const QHostAddress &key, uint seed) Q_DECL_NOTHROW
 */
 
 /*!
+    \fn bool operator!=(QHostAddress::SpecialAddress lhs, const QHostAddress &rhs)
     \relates QHostAddress
     \since 5.9
-    \fn operator!=(QHostAddress::SpecialAddress lhs, const QHostAddress &rhs)
 
     Returns \c false if special address \a lhs is the same as host address \a rhs;
     otherwise returns \c true.

src/network/kernel/qnetworkinterface.cpp

@@ -166,7 +166,7 @@ QString QNetworkInterfacePrivate::makeHwAddress(int len, uchar *data)
 */
 
 /*!
-    \enum QNetworkAddressEntry::DnsEligilibilityStatus
+    \enum QNetworkAddressEntry::DnsEligibilityStatus
     \since 5.11
 
     This enum indicates whether a given host address is eligible to be

src/network/ssl/qsslsocket.cpp

@@ -215,7 +215,7 @@
 */
 
 /*!
-    \fn QSslSocket::encrypted()
+    \fn void QSslSocket::encrypted()
 
     This signal is emitted when QSslSocket enters encrypted mode. After this
     signal has been emitted, QSslSocket::isEncrypted() will return true, and
@@ -225,7 +225,7 @@
 */
 
 /*!
-    \fn QSslSocket::modeChanged(QSslSocket::SslMode mode)
+    \fn void QSslSocket::modeChanged(QSslSocket::SslMode mode)
 
     This signal is emitted when QSslSocket changes from \l
     QSslSocket::UnencryptedMode to either \l QSslSocket::SslClientMode or \l
@@ -235,7 +235,7 @@
 */
 
 /*!
-    \fn QSslSocket::encryptedBytesWritten(qint64 written)
+    \fn void QSslSocket::encryptedBytesWritten(qint64 written)
     \since 4.4
 
     This signal is emitted when QSslSocket writes its encrypted data to the

src/network/ssl/qsslsocket_openssl11.cpp

@@ -73,9 +73,6 @@ QT_BEGIN_NAMESPACE
 
 Q_GLOBAL_STATIC_WITH_ARGS(QMutex, qt_opensslInitMutex, (QMutex::Recursive))
 
-/*!
-    \internal
-*/
 void QSslSocketPrivate::deinitialize()
 {
     // This function exists only for compatibility with the pre-11 code,

src/network/ssl/qsslsocket_opensslpre11.cpp

@@ -198,9 +198,6 @@ static void q_OpenSSL_add_all_algorithms_safe()
 }
 
 
-/*!
-    \internal
-*/
 void QSslSocketPrivate::deinitialize()
 {
     q_CRYPTO_set_id_callback(0);