Fix typo

Change-Id: I917ad7304c479d8f0c807cfd77d87c56cfb25b93
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/173603
Tested-by: Julien Nabet <serval2412@yahoo.fr>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

dbaccess/source/core/inc/connection.hxx

@@ -210,7 +210,7 @@ private:
             if the implementation cannot be loaded
 
         @postcond
-            m_xConnectionTools is nol <NULL/>
+            m_xConnectionTools is not <NULL/>
     */
     void    impl_loadConnectionTools_throw();