fix: clarified that date of birth is also collected for age verification

privacy-policy.html

@@ -6,6 +6,7 @@
 <ul>
     <li>Your name or username.</li>
     <li>Your email address.</li>
+    <li>Your date of birth.</li>
     <li>Your IP address.</li>
 </ul>
 <p>Further data may be collected if you choose to share it, such as if you fill out fields on your profile.</p>
@@ -23,6 +24,7 @@
     <li>For the purposes of making you a registered member of our site, in order for you to contribute content to this site.</li>
     <li>We may use your email address to inform you of activity on our site.</li>
     <li>Your IP address is recorded when you perform certain actions on our site. Your IP address is never publicly visible.</li>
+    <li>Your date of birth is used verify that you are over the age of 13.</li>
 </ul>
 
 <h2>Other ways we may use your personal information.</h2>