Fix some typos in docs and examples and make the code look nicer.

Doc/Manual/Modula3.html

@@ -684,7 +684,7 @@ consist of the following parts:
 </tr>
 <tr>
   <td>m3wrapfreearg</td>
-  <td><tt>M3toC.FreeSharedS(str,arg1);</tt></td>
+  <td><tt>M3toC.FreeSharedS(str, arg1);</tt></td>
   <td>
     Free resources that were temporarily used in the wrapper.
     Since this step should never be skipped,
@@ -858,7 +858,7 @@ where almost everything is generated by a typemap:
           RAISE E("invalid checksum");
         END;
       FINALLY
-        M3toC.FreeSharedS(str,arg1);     <I>(* m3wrapfreearg *)</I>
+        M3toC.FreeSharedS(str, arg1);     <I>(* m3wrapfreearg *)</I>
       END;
     END Name;
 </pre></div>
@@ -891,7 +891,7 @@ where almost everything is generated by a typemap:
 <tr>
   <td>constnumeric</td>
   <td><tt>%constnumeric(12) twelve;</tt> or
-      <tt>%feature("constnumeric","12") twelve;</tt></td>
+      <tt>%feature("constnumeric", "12") twelve;</tt></td>
   <td>This feature can be used to tell Modula-3's back-end of SWIG
       the value of an identifier.
       This is necessary in the cases