Fix capitalization in "refresh service" link.

Co-authored-by: Ted Thibodeau Jr <[email protected]>

Author: msporny

index.html

@@ -879,7 +879,7 @@ <h3>BitstringStatusListCredential</h3>
                       <td>`refresh`</td>
                       <td>
 Used to signal that an updated [=verifiable credential=] is available via the
-credential's <a data-cite="VC-DATA-MODEL-2.0#refreshing">Refresh service</a>
+credential's <a data-cite="VC-DATA-MODEL-2.0#refreshing">refresh service</a>
 feature. This status is not reversible.
                       </td>
                     </tr>