Update description of beta challenge

challenges/02-javascript-algorithms-and-data-structures/es6.json

@@ -379,17 +379,17 @@
         "We earlier saw how spread operator can effectively spread, or unpack, the contents of the array.",
         "We can do something similar with objects as well. <dfn>Destructuring assignment</dfn> is special syntax for neatly assigning values taken directly from an object to variables.",
         "Consider the following ES5 code:",
-        "<blockquote>const voxel = {x: 3.6, y: 7.4, z: 6.54 };<br>const x = voxel.x; // x = 3.6<br>const y = voxel.y; // y = 7.4<br>const z = voxel.z; // z = 6.54</blockquote>",
+        "<blockquote>var voxel = {x: 3.6, y: 7.4, z: 6.54 };<br>var x = voxel.x; // x = 3.6<br>var y = voxel.y; // y = 7.4<br>var z = voxel.z; // z = 6.54</blockquote>",
         "Here's the same assignment statement with ES6 destructuring syntax:",
         "<blockquote>const { x, y, z } = voxel; // x = 3.6, y = 7.4, z = 6.54</blockquote>",
         "If instead you want to store the values of <code>voxel.x</code> into <code>a</code>, <code>voxel.y</code> into <code>b</code>, and <code>voxel.z</code> into <code>c</code>, you have that freedom as well.",
-        "<blockquote>const { x : a, y : b, z : c } = voxel // a = 3.6, y = 7.4, z = 6.54</blockquote>",
+        "<blockquote>const { x : a, y : b, z : c } = voxel // a = 3.6, b = 7.4, c = 6.54</blockquote>",
         "You may read it as \"get the field <code>x</code> and copy the value into <code>a</code>,\" and so on.",
         "<hr>",
         "Use destructuring to obtain the length of the string <code>greeting</code>"
       ],
       "challengeSeed": [
-        "const greeting = 'itadakimasu'",
+        "const greeting = 'itadakimasu';",
         "// change code below this line",
         "const length = 0; // change this",
         "// change code above this line",