Update chapters/functions.tex

Remove 'all'

Co-authored-by: Henrik Tidefelt <henrikt@wolfram.com>

chapters/functions.tex

@@ -1756,7 +1756,7 @@ \subsubsection{Simple Types}\label{simple-types}
 \begin{nonnormative}
 The reason why it is not allowed to return a string allocated with, for instance, \lstinline[language=C]!malloc! is that there is no transfer of ownership when a string is returned from the external function.
 The external code would remain the owner of such a string, and would be responsible for eventually releasing the memory at some point.
-Consequently, the Modelica simulation environment would not be able to assume that all only its own string deallocation routines could invalidate any of the strings returned by external functions.
+Consequently, the Modelica simulation environment would not be able to assume that only its own string deallocation routines could invalidate any of the strings returned by external functions.
 \end{nonnormative}
 
 \lstinline!Boolean! values are mapped to C such that \lstinline!false! in Modelica is 0 in C and \lstinline!true! in Modelica is 1 in C.  If the returned value from C is 0 it is treated as \lstinline!false! in Modelica; otherwise as \lstinline!true!.