Add the missing newlines between repeated extension files.

objectivec/GPBUtilities.m

@@ -1949,11 +1949,11 @@ static void AppendTextFormatForMessageExtensionRange(GPBMessage *message,
 
       }  // switch(extDataType)
 
-    }  //  for(numValues)
-
       // End the line.
       [toStr appendFormat:@"%@\n", lineEnding];
 
+    }  //  for(numValues)
+
   }  // for..in(activeExtensions)
 }