Remove unnecessary comma

Author: josemaia

articles/key-vault/about-keys-secrets-and-certificates.md

@@ -193,7 +193,7 @@ You can specify additional application-specific metadata in the form of tags. Ke
 
 ###  Key access control
 
-Access control for keys managed by Key Vault is provided at the level of a Key Vault that acts as the container of keys. The access control policy for keys, is distinct from the access control policy for secrets in the same Key Vault. Users may create one or more vaults to hold keys, and are required to maintain scenario appropriate segmentation and management of keys. Access control for keys is independent of access control for secrets.  
+Access control for keys managed by Key Vault is provided at the level of a Key Vault that acts as the container of keys. The access control policy for keys is distinct from the access control policy for secrets in the same Key Vault. Users may create one or more vaults to hold keys, and are required to maintain scenario appropriate segmentation and management of keys. Access control for keys is independent of access control for secrets.  
 
 The following permissions can be granted, on a per user / service principal basis, in the keys access control entry on a vault. These permissions closely mirror the operations allowed on a key object.  Granting access to an service principal in key vault is a onetime operation, and it will remain same for all Azure subscriptions. You can use it to deploy as many certificates as you want.