[dcl.enum] Remove extraneous spaces from example (#6381)

Author: Eisenwave

source/declarations.tex

@@ -7289,15 +7289,15 @@
 \begin{codeblock}
 enum direction { left='l', right='r' };
 
-void g()  {
+void g() {
   direction d;                  // OK
   d = left;                     // OK
   d = direction::right;         // OK
 }
 
 enum class altitude { high='h', low='l' };
 
-void h()  {
+void h() {
   altitude a;                   // OK
   a = high;                     // error: \tcode{high} not in scope
   a = altitude::low;            // OK