docs: update text and image for "let me make it mine" prinicple in design guide

bug: 5853519

Change-Id: I7cccbb6d6eb94f29cbad24d3a07c9222a963434c

Author: scottamain

docs/html/design/get-started/principles.html

@@ -147,8 +147,9 @@ <h4>Real objects are more fun than buttons and menus</h4>
   <div class="layout-content-col span-7">
 
 <h4>Let me make it mine</h4>
-<p>Let people add a personal touch because it helps them feel at home and in control. Think about
-subtle ways to offer personalization while providing sensible and beautiful default functionality.</p>
+<p>People love to add personal touches because it helps them feel at home and in control. Provide
+sensible, beautiful defaults, but also consider fun, optional customizations that don’t hinder
+primary tasks.</p>
 
   </div>
   <div class="layout-content-col span-6">