Updated Nim for C programmers (markdown)

Nim-for-C-programmers.md

@@ -302,9 +302,10 @@ proc bar(): int =
 proc baz(x: int): int =
   x*2
 
-proc foobar(x: var int): int =
+proc foobar(x: var int): 
+                  int =
   inc(x)
-  result = x*2  # also valid
+  result = x*2
 </pre>
 </td>
 <td><b>Function/Procedure.</b>  </td>