Fixup: remove trailing whitespace

Author: jensmaurer

source/expressions.tex

@@ -6866,9 +6866,9 @@
 int y;
 const int a = std::is_constant_evaluated() ? y : 1;     // dynamic initialization to 1
 double z[a];                                            // ill-formed: "a" is not "usable in constant expressions"
-const int b = std::is_constant_evaluated() ? 2 : y;     // static initialization to 2 
+const int b = std::is_constant_evaluated() ? 2 : y;     // static initialization to 2
 int c = y + (std::is_constant_evaluated() ? 2 : y);     // dynamic initialization to y+y
-  
+
 constexpr int f() {
   const int n = std::is_constant_evaluated() ? 13 : 17; // n == 13
   int m = std::is_constant_evaluated() ? 13 : 17;       // m might be 13 or 17 (see below)