demo, css: rename "Line Folding" label and comment to "Wrap Lines"

Update the demo UI label and the CSS section comment to use the
canonical "Wrap Lines" name, consistent with the `wrapLines`
config option.

Author: mohanapriyac9691

src/ui/css/diff2html.css

@@ -600,7 +600,7 @@
   border: var(--d2h-dark-moved-label-color) 1px solid;
 }
 
-/* line folding */
+/* wrap lines */
 
 .d2h-wrapped-file-diff .d2h-file-side-diff {
   flex-basis: 100%;

website/templates/pages/demo/content.handlebars

@@ -54,7 +54,7 @@
       </div>
       <div class="column is-one-sixth-widescreen">
         <label title="Show the file list summary before the diff">
-          <p>Line Folding</p>
+          <p>Wrap Lines</p>
           <input class="options-label-value" id="diff-url-options-line-folding" type="checkbox" name="wrapLines"/>
         </label>
       </div>