Update tags support for managedInstances/databases

Based on "Tagging managed database is not a supported scenario. We have it in our pipeline to support it, but right now it isn't."
Source: https://icm.ad.msft.net/imp/v3/incidents/details/157008742/home

Author: vitomaz-msft

articles/azure-resource-manager/tag-support.md

@@ -1815,7 +1815,7 @@ Jump to a resource provider namespace:
 > | Resource type | Supports tags | Tag in cost report |
 > | ------------- | ----------- | ----------- |
 > | managedInstances | Yes | Yes |
-> | managedInstances/databases | Yes (see [note below](#sqlnote)) | Yes |
+> | managedInstances/databases | No | No |
 > | managedInstances/databases/backupShortTermRetentionPolicies | No | No |
 > | managedInstances/databases/schemas/tables/columns/sensitivityLabels | No | No |
 > | managedInstances/databases/vulnerabilityAssessments | No | No |