docs: Detail PAT expiration in Tableau

Author: igorlukanin

docs/pages/product/workspace/semantic-layer-sync/tableau.mdx

@@ -40,6 +40,13 @@ also make sure to renew your personal access token in time.
 
 </InfoBox>
 
+<WarningBox>
+
+Personal access tokens expire if they are not used after 15 consecutive days.
+If they are used more frequently than every 15 days, they expire after one year.
+
+</WarningBox>
+
 You will also need to specify a `region` and a Tableau `site` name. Consider the
 following URL of a Tableau site: `https://10ax.online.tableau.com/#/site/cubedev/home`.
 In this case, the region would be `10ax` and the site name would be `cubedev`.
@@ -114,4 +121,4 @@ Use can open it in Tableau to create a data source.
 [tds]: https://help.tableau.com/current/pro/desktop/en-us/export_connection.htm
 [tableau-api]: https://help.tableau.com/current/api/rest_api/en-us/REST/rest_api.htm
 [tableau-api-authentication]: https://help.tableau.com/current/server/en-us/security_personal_access_tokens.htm#create-personal-access-tokens
-[tableau-pat]: https://help.tableau.com/current/server/en-us/security_personal_access_tokens.htm
+[tableau-pat]: https://help.tableau.com/current/server/en-us/security_personal_access_tokens.htm