Change 'Overconstrained Connectors' -> '... Connections'

As suggested by @HansOlsson.

Co-authored-by: Hans Olsson <HansOlsson@users.noreply.github.com>

chapters/connectors.tex

@@ -671,7 +671,7 @@ \subsection{Balancing Restriction and Size of Connectors}\label{balancing-restri
 \end{lstlisting}
 \end{example}
 
-\section{Overconstrained Connectors}\label{equation-operators-for-overconstrained-connection-based-equation-systems1}\label{overconstrained-connectors}
+\section{Overconstrained Connections}\label{equation-operators-for-overconstrained-connection-based-equation-systems1}\label{overconstrained-connections}
 
 There is a special problem regarding equation systems resulting from \emph{loops} in connection graphs where the connectors contain \emph{non-flow} (i.e., potential) variables \emph{dependent} on each other.
 When a loop structure occurs in such a graph, the resulting equation system will be \emph{overconstrained}, i.e., have more equations than variables, since there are implicit constraints between certain non-flow variables in the connector in addition to the connection equations around the loop.