[rte] Doc: fixes the default value of option -warn-special-float.

doc/rte/rte.tex

@@ -817,7 +817,7 @@ right shift on negative values \\
 \lstinline|-warn-invalid-bool| & boolean (true) & Generate annotations for
 \lstinline|_Bool| trap representations \\
 \hline
-\lstinline|-warn-special-float| &  string: \lstinline|non-finite|, (\lstinline|nan|) or \lstinline|none|  & generate annotations when
+\lstinline|-warn-special-float| &  string: (\lstinline|non-finite|), \lstinline|nan| or \lstinline|none|  & generate annotations when
 special floats are produced: infinite floats or NaN (by default), only on NaN or never. \\
 \hline
 \lstinline|-warn-invalid-pointer| & boolean (false) & Generate annotations for