docs: add a link to snapcraft authentication options for cd in snap.md

docs/configuration/snap.md

@@ -79,7 +79,7 @@ The top-level [snap](configuration.md#Configuration-snap) key contains set of op
 <p>Inherited from <code>TargetSpecificOptions</code>:</p>
 <ul>
 <li><code id="SnapOptions-artifactName">artifactName</code> String | “undefined” - The <a href="/configuration/configuration#artifact-file-name-template">artifact file name template</a>.</li>
-<li><code id="SnapOptions-publish">publish</code> The <a href="/configuration/publish">publish</a> options.</li>
+<li><code id="SnapOptions-publish">publish</code> The <a href="/configuration/publish">publish</a> options.</li> To publish directly to Snapcraft, see <a href="https://snapcraft.io/docs/snapcraft-authentication">Snapcraft authentication options</a> for local or CI/CD authentication options.
 </ul>
 
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