\int_eval:w doc typo

closes #489

l3kernel/l3int.dtx

@@ -94,7 +94,7 @@
 %
 % \begin{function}[EXP, added = 2018-03-30]{\int_eval:w}
 %   \begin{syntax}
-%     \cs{int_eval:w} \Arg{integer expression}
+%     \cs{int_eval:w} \meta{integer expression}
 %   \end{syntax}
 %   Evaluates the \meta{integer expression} as described for
 %   \cs{int_eval:n}. The end of the expression is the first token
@@ -885,7 +885,7 @@
 %   space it is removed as in \texttt{f}-expansion, and so \cs{exp_stop_f:}
 %   may be employed as an end marker. Note that protected functions
 %   \emph{are} expanded by this process.
-%   
+%
 %   This function requires exactly one expansion to produce a value, and so
 %   is suitable for use in cases where a number is required \enquote{directly}.
 %   In general, \cs{int_eval:n} is the preferred approach to generating