download: update verification procedure for linux

checked with Ubuntu 22.04 (jammy) in a docker container

Author: pinheadmz

_includes/templates/download.html

@@ -256,7 +256,9 @@ <h2 style="text-align: center" id="{{page.verify_download | slugify}}">{{page.ve
 
         <p>{{page.release_key_obtained}}</p></li>
 
-      <li><p>{{page.choosing_builders | replace: '$(BUILDER_KEYS_URL)', page.builder_keys_url }}</p></li>
+      <li>{{page.choosing_builders}}
+
+        <pre class="highlight"><code>git clone {{GUIX_REPOSITORY_URL}}</code><br><code>gpg --import {{GUIX_REPOSITORY_NAME}}/{{BUILDER_KEYS_DIR}}/*</code></pre></li>
 
       <li>{{page.verify_checksums_file}}
 
@@ -267,8 +269,9 @@ <h2 style="text-align: center" id="{{page.verify_download | slugify}}">{{page.ve
           <li><p>{{page.complete_line_saying}} <code>{{page.localized_gpg_primary_fingerprint}} {{SIGNING_KEY_FINGERPRINT_EXPLODED}}</code></p></li>
         </ol>
 
-        <p>{{page.gpg_trust_warning | replace: '$(SHORT_BUILDER_KEY)', SHORT_BUILDER_KEY }}</p></li>
-
+        <p>{{page.gpg_trust_warning | replace: '$(SHORT_BUILDER_KEY)', SHORT_BUILDER_KEY }}
+           <a href="{{GPG_VERIFY_KEYS_URL}}">{{page.verify_keys}}</a>
+        </p></li>
     </ol>
   </details>