fix deprecation message

Author: maddieclayton

src/ResourceManager/KeyVault/Commands.KeyVault/Commands/ManagedStorageAccounts/SetAzureKeyVaultManagedStorageSasDefinition.cs

@@ -62,7 +62,7 @@ public partial class SetAzureKeyVaultManagedStorageSasDefinition : KeyVaultCmdle
             ValueFromPipelineByPropertyName = true,
             HelpMessage = "Sas definition parameters that will be used to create the sas token.",
             ParameterSetName = ParameterSetRawSas )]
-        [Obsolete("-Parameter will become optional and will have its position removed in May 2018")]
+        [Obsolete("-Parameter will be removed and replaced by -TemplateUri and -SasType in May 2018")]
         [ValidateNotNull]
         public Hashtable Parameter { get; set; }
 

src/ResourceManager/KeyVault/documentation/upcoming-breaking-changes.md

@@ -33,7 +33,7 @@ The following cmdlets were affected this release:
 - The -Certificate parameter has become mandatory.
 
 **Set-AzureKeyVaultManagedStorageSasDefinition**
-- The -Parameter parameter no longer has a position.
+- The -Parameter parameter has been removed and replaced by -TemplateUri and -SasType
 
 **Set-AzureKeyVaultCertificateIssuer**
 - The -IssuerProvider parameter has become mandatory.