Note that phone numbers are visible to leaders

By suggestion from Bjorn.

ws/templates/privacy/home.html

@@ -59,7 +59,7 @@ <h3>Sharing Information</h3>
       We will occasionally share your name, email address, and car description with
       other participants for trip-planning purposes. Your name and email address
       are displayed ubiquitously throughout the system, but never on a
-      public-facing page.
+      public-facing page. Your cell phone number is visible to trip leaders.
     </p>
     <p>In the event of an emergency, your medical information may be used to:
       <ul>