Update dvcs.html

Edit: remove repetition

works/dvcs.html

@@ -44,18 +44,18 @@ my profile on Sourcerer
     
   </ol>
   </p>
-<p>As of 21st June 2020, my online Git-related accounts are the following:
+<p>As of 21st June 2020, my online Git-related accounts are under the user-name "phtan", at:
   <ul>
     <li><a href="https://github.com/phtan/">
-      Github, at the user-name "phtan"
+      Github
       </a>
     </li>
     <li><a href="https://gitlab.com/phtan">
-      Gitlab, at the same user-name
+      Gitlab
       </a>
     </li>
     <li><a href="https://codeberg.org/phtan">
-      Codeberg, at the same user-name
+      Codeberg
       </a>
     </li>
 </ul>