Dev tab, change pre-release example to ast18

Author: abelbeck

dev.html

@@ -57,16 +57,16 @@ <h2>Development Testing:</h2>
 <small>Note: You must use an HTTP repository URL for systems older than AstLinux 1.2.7</small>
 </p>
 <p>
-Example: Upgrade to the latest pre-release testing image containing Asterisk 16 via the CLI:
+Example: Upgrade to the latest pre-release testing image containing Asterisk 18 via the CLI:
 </p>
 <pre>
-upgrade-run-image check https://astlinux-project.org/beta/ast16-firmware-1.x
+upgrade-run-image check https://astlinux-project.org/beta/ast18-firmware-1.x
 </pre>
 <p>
 (if it looks good, then)
 </p>
 <pre>
-upgrade-run-image upgrade https://astlinux-project.org/beta/ast16-firmware-1.x
+upgrade-run-image upgrade https://astlinux-project.org/beta/ast18-firmware-1.x
 </pre>
 <h2>Development Source:</h2>
 <p class="dialogText">