docs: fix relative url

Author: JTorreG

layouts/partials/license.html

@@ -4,7 +4,7 @@
    <span style="vertical-align: middle; line-height: 1.5;">
        <strong>Licensing changes:</strong> Starting with NGINX Plus R33, all NGINX Plus instances must use a subscription token to validate their license and report usage data.<br>
        <span style="display: inline-block; padding-left: calc(1.5rem + 18px);">
-           See <a href="https://docs.nginx.com/solutions/about-subscription-licenses/">About subscription licenses</a> for more information.
+           See <a href="{{ "/solutions/about-subscription-licenses/" | absURL }}">About subscription licenses</a> for more information.
        </span>
    </span>
    <button type="button" class="close" data-dismiss="alert" aria-label="Close" style="background: none; border: none; font-size: 3rem; line-height: 1;" onclick="dismissAlert()">