[localization, diff] Remove superfluous 'return 0;' from 'main' in examples. (#1482)

Author: Eelis

source/compatibility.tex

@@ -1114,7 +1114,6 @@
   delete i;                     // single-object delete
   int* a = new int[3];
   delete [] a;                  // array delete
-  return 0;
 }
 \end{codeblock}
 
@@ -1323,7 +1322,6 @@
 int main() {
   int flag = std::ios_base::hex;
   std::cout.setf(flag);         // error: \tcode{setf} does not take argument of type \tcode{int}
-  return 0;
 }
 \end{codeblock}
 

source/locales.tex

@@ -5626,7 +5626,6 @@
   wchar_t c = use_facet<wctype>(loc).widen('!');
   if (!use_facet<My::JCtype>(loc).is_kanji(c))
     cout << "no it isn't!" << endl;
-  return 0;
 }
 \end{codeblock}
 
@@ -5667,7 +5666,6 @@
   locale loc(locale(""), new My::BoolNames(""));
   cout.imbue(loc);
   cout << boolalpha << "Any arguments today? " << (argc > 1) << endl;
-  return 0;
 }
 \end{codeblock}
 \end{example}