Doc: Fix documentation warnings for Qt Network

Task-number: QTBUG-86295
Change-Id: Ib8bcf0a6e2af8a589b44e56b19641f4d2fe6f800
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

src/network/doc/snippets/network/network.pro

@@ -1,6 +1,10 @@
 TEMPLATE = lib
 TARGET = network_snippet
-QT = core network
+QT = core
+
+#! [0]
+QT += network
+#! [0]
 
 SOURCES = \
     tcpwait.cpp

src/network/doc/src/qtnetwork.qdoc

@@ -37,13 +37,13 @@
     \include module-use.qdocinc using qt module
     \snippet doc/snippets/CMakeLists.txt 0
 
-    See also the \l[QtDoc]{Build with CMake} overview.
+    See also the \l {Build with CMake} overview.
 
     \section2 Building with qmake
 
     Add \c network to the \c QT variable:
 
-    \snippet doc/snippets/snippets.pro 0
+    \snippet doc/snippets/network/network.pro 0
 
     \section1 Articles and Guides
 

src/network/ssl/qsslpresharedkeyauthenticator.cpp

@@ -240,11 +240,11 @@ int QSslPreSharedKeyAuthenticator::maximumPreSharedKeyLength() const
 }
 
 /*!
-    \relates QSslPreSharedKeyAuthenticator
+    \fn QSslPreSharedKeyAuthenticator::operator==(const QSslPreSharedKeyAuthenticator &lhs, const QSslPreSharedKeyAuthenticator &rhs)
     \since 5.5
 
-    Returns true if the authenticator object \a lhs is equal to \a rhs; false
-    otherwise.
+    Returns \c true if the authenticator object \a lhs is equal to \a rhs;
+    \c false otherwise.
 
     Two authenticator objects are equal if and only if they have the same
     identity hint, identity, pre shared key, maximum length for the identity