Skip 'and format is not provided'

As suggested by Per.

chapters/operatorsandexpressions.tex

@@ -511,7 +511,7 @@ \subsection{Numeric Functions and Conversion Functions}\label{numeric-functions-
   \lstinline!Boolean leftJustified = true!: If true, the converted result is left justified in the string; if false it is right justified in the string.
 \item
   \lstinline!Integer significantDigits = 6!: Number of significant digits in the result string.
-  Only allowed when formatting a \lstinline!Real! value (and \lstinline!format! is not provided).
+  Only allowed when formatting a \lstinline!Real! value.
 \end{itemize}
 
 For \lstinline!Real! expressions the output shall be according to the Modelica grammar.