[v10.0.x] Docs: adds aliases to fix 404s (#71937)

Docs: adds aliases to fix 404s (#71926)

* Docs: adds aliases to fix 404s

* fixes alias

* updates alias re jack

(cherry picked from commit 58729a331f)

Co-authored-by: brendamuir <100768211+brendamuir@users.noreply.github.com>

docs/sources/alerting/_index.md

@@ -1,7 +1,8 @@
 ---
 aliases:
   - about-alerting/
-  - unified-alerting/alerting/
+  - ./unified-alerting/alerting/
+  - ./alerting/unified-alerting/
 canonical: https://grafana.com/docs/grafana/latest/alerting/
 description: Intro to key benefits and features of Grafana Alerting
 labels:

docs/sources/alerting/manage-notifications/create-silence.md

@@ -5,6 +5,7 @@ aliases:
   - ../silences/linking-to-silence-form/
   - ../silences/remove-silence/
   - ../unified-alerting/silences/
+  - ../silences/
 canonical: https://grafana.com/docs/grafana/latest/alerting/manage-notifications/create-silence/
 description: Add silence alert notification
 keywords: