Clarify non-normative text.

Closes modelica#3194
(well modelica#3195 is needed for the example-update.)

chapters/connectors.tex

@@ -119,6 +119,8 @@ \subsection{Expandable Connectors}\label{expandable-connectors}
   \item
     If the variable on the other side of the \lstinline!connect!-equation is \lstinline!input! or \lstinline!output! the new component will be either \lstinline!input! or \lstinline!output! to satisfy the restrictions in \cref{restrictions-of-connections-and-connectors} for a non-expandable connector.
     \begin{nonnormative}
+    The general rule ensures consistency for inside and outside connectors, and handles multiple connections to new component.
+    For the simple case of no other connections involving these variables it can be explained as follows:
     If the existing side refers to an inside connector (i.e.\ a connector of a component) the new variable will copy its causality, i.e.\ \lstinline!input! if \lstinline!input! and \lstinline!output! if \lstinline!output!, since the expandable connector must be an outside connector.
     \end{nonnormative}
     For an array the \lstinline!input!/\lstinline!output! property can be deduced separately for each array element.