Update 646-language-endif.markdown

Author: Joe7M

_build/reference/646-language-endif.markdown

@@ -2,6 +2,15 @@
 
 > ENDIF
 
-foo = 1: if foo==1: ? "one": ENDIF
+ENDIF ends an if statement. For more information see IF.
+
+### Example
+
+```
+foo = 1
+if foo == 1 then
+  print "one"
+endif
+```