Update managed-redis-planning-faq.yml

The pricing link was pointing to the Azure Cache for Redis pricing (https://azure.microsoft.com/en-us/pricing/details/cache/) page instead of the Azure Managed Redis pricing 
https://azure.microsoft.com/en-us/pricing/details/managed-redis/

Author: normseq

articles/azure-cache-for-redis/managed-redis/managed-redis-planning-faq.yml

@@ -37,7 +37,7 @@ sections:
       - question: |
           How am I billed for Azure Managed Redis?
         answer: |
-          Azure Managed Redis pricing is [here](https://azure.microsoft.com/pricing/details/cache/). The pricing page lists pricing as an hourly and monthly rate. Caches are billed on a per-minute basis. The period is measured from time a cache is created until the time that a cache is deleted.
+          Azure Managed Redis pricing is [here](https://azure.microsoft.com/en-us/pricing/details/managed-redis/). The pricing page lists pricing as an hourly and monthly rate. Caches are billed on a per-minute basis. The period is measured from time a cache is created until the time that a cache is deleted.
           There's no option for stopping or pausing the billing of a cache.
           
       - question: |