Updated docs and added constants to tracker

doc/doc_files/func_sub.html

@@ -156,6 +156,7 @@
 		 The above code is the same as the previous example except that now we use the <b>BYREF</b> keyword to change a to a reference rather than a value.  This means the when we pass the variable N to MYSUB, instead of the value stored in N being used as A, whatever we do to A will be done to N directly.  This example will output 5 to the console. 
 		</p>
 		<p>
+		</p>
 
 	</body>
 </html>