Fix the documentation on how to use -openssl-linked.

You set the environment /before/ you run configure.

Change-Id: I6954656f892214f41b5f2ec4e3f4926eb5a9e247
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>

src/network/doc/src/ssl.qdoc

@@ -57,7 +57,7 @@
     system:
 
     \code
-        ./configure -openssl-linked OPENSSL_LIBS='-L/opt/ssl/lib -lssl -lcrypto'
+        OPENSSL_LIBS='-L/opt/ssl/lib -lssl -lcrypto' ./configure -openssl-linked
     \endcode
 
     To disable SSL support in a Qt build, configure Qt with the \c{-no-openssl}