Tweak "Hello, world!" lab to match new lab format (#452)

Signed-off-by: David A. Wheeler <[email protected]>

Author: david-a-wheeler

docs/labs/hello.html

@@ -124,10 +124,9 @@ <h1>Lab Exercise hello</h1>
 the labs</a>.
 
 <p>
-<h2>Task</h2>
+<h2>Goal</h2>
 <p>
-<b>Please write code to print "Hello, world!" (not including the quotes)
-for JavaScript on Node.js, while also learning how our labs work.</b>
+<b>Learn how to use our labs by writing a "Hello, world!" program.</b>
 
 <p>
 <h2>Background</h2>
@@ -144,8 +143,9 @@ <h2>Task Information</h2>
 <p>
 
 <p>
-Please change this program to print "Hello, world!" and while
-doing so, experiment with the buttons below labelled
+Your task is to change the program below
+to print "Hello, world!" to learn how our labs work.
+Please experiment with the buttons below labelled
 <i>Hint</i>, <i>Reset</i>, and <i>Give up</i>.
 
 <p>
@@ -156,6 +156,10 @@ <h2>Task Information</h2>
 <p>
 <h2>Interactive Lab (<span id="grade"></span>)</h2>
 <p>
+<b>Please modify the code below to print "Hello, world!"
+(not including the quotes)
+for JavaScript on Node.js, while also learning how our labs work.</b>
+<p>
 <!--
 You can use this an example for new labs.
 For multi-line inputs, instead of <input id="attempt0" type="text" ...>, use