Fixes rescript-lang#72

Author: chenglou

pages/docs/manual/latest/overview.mdx

@@ -231,3 +231,5 @@ Array                           | `[1, 2, 3]`                          | `[1, 2,
 Record                          | `type t = {b: int}; let a = {b: 10}` | `var a = {b: 10}`
 Multiline Comment               | `/* Comment here */`                 | Not in output
 Single line Comment             | `// Comment here`                    | Not in output
+
+_Note that this is a cleaned-up comparison table; a few examples' JavaScript output are slightly different in reality._