[dcl.pre] Fix spacing

Author: tkoeppe

source/declarations.tex

@@ -331,8 +331,8 @@
 }
 
 void g(char c) {
-  f(0);                                 // OK
-  f(c);                                 // error on implementations where \tcode{sizeof(int) > 1}: must be \tcode{int}-sized
+  f(0);             // OK
+  f(c);             // error on implementations where \tcode{sizeof(int) > 1}: must be \tcode{int}-sized
 }
 \end{codeblock}
 \end{example}