[dcl.type.auto.deduct] Make f1 example well-formed

Author: Quuxplusone

source/declarations.tex

@@ -2182,7 +2182,7 @@
 decltype(auto) x6d = { 1, 2 };  // error: \tcode{\{ 1, 2 \}} is not an expression
 auto          *x7a = &i;        // \tcode{decltype(x7a)} is \tcode{int*}
 decltype(auto)*x7d = &i;        // error: declared type is not plain \tcode{decltype(auto)}
-auto f1(int x) -> decltype((x)) { return (x); }         // return type is \tcode{int\&}
+auto f1(int x) -> decltype((x));                        // return type is \tcode{int\&}
 auto f2(int x) -> decltype(auto) { return (x); }        // return type is \tcode{int\&\&}
 \end{codeblock}
 \end{example}