[javascript/en] Reorder block (#4706)

It makes more sense here, as in the type coercion on addition is what
leads to the weird behavoir.

Co-authored-by: Chris Harding <christopher.harding@galvanize.com>

javascript.html.markdown

@@ -105,6 +105,10 @@ false;
 "1, 2, " + 3; // = "1, 2, 3"
 "Hello " + ["world", "!"]; // = "Hello world,!"
 
+// ...which can result in some weird behaviour...
+13 + !0; // 14
+"13" + !0; // '13true'
+
 // and are compared with < and >
 "a" < "b"; // = true
 
@@ -116,10 +120,6 @@ null == undefined; // = true
 "5" === 5; // = false
 null === undefined; // = false
 
-// ...which can result in some weird behaviour...
-13 + !0; // 14
-"13" + !0; // '13true'
-
 // You can access characters in a string with `charAt`
 "This is a string".charAt(0);  // = 'T'