Clarify that github donations are in USD

docs/donate.md

@@ -182,6 +182,7 @@ While we are a registered non-profit organization, we are not a registered chari
           <li>Options for one time donations and recurring monthly donations.</li>
           <li>Supports credit card payments.</li>
           <li>Requires a GitHub account.</li>
+          <li>Amounts in USD.</li>
         </ul>
       </td>
     </tr>
@@ -246,4 +247,4 @@ While we are a registered non-profit organization, we are not a registered chari
 
 **Other Methods**
 
-Is there another way you would like to donate? You can post a message in our <a href="https://lemmy.ca/c/main">Lemmy community</a> or send us an email at <a href="mailto:support@fedecan.ca">support@fedecan.ca</a>.
+Is there another way you would like to donate? You can post a message in our <a href="https://lemmy.ca/c/main">Lemmy community</a> or send us an email at <a href="mailto:support@fedecan.ca">support@fedecan.ca</a>.