Update TOC.yml

Author: Juliako

articles/media-services/latest/TOC.yml

@@ -194,10 +194,10 @@
   - name: High availability
     items:
     - name: Encoding
-      displayName: failover, bcdr
+      displayName: failover, bcdr, HA, high availability
       href: media-services-high-availability-encoding.md
     - name: Streaming
-      displayName: failover, bcdr
+      displayName: failover, bcdr, HA, high availability
       href: media-services-high-availability-streaming.md
   - name: Migration guidance from v2 to v3
     href: migrate-from-v2-to-v3.md