Update Set-AzNetworkSecurityRuleConfig.md (#14176)

Author: webguynj

src/Network/Network/help/Set-AzNetworkSecurityRuleConfig.md

@@ -47,7 +47,7 @@ PS C:\> Set-AzNetworkSecurityRuleConfig -Name "rdp-rule" -NetworkSecurityGroup $
 
 The first command gets the network security group named NSG-FrontEnd, and then stores it in the variable $nsg.
 The second command uses the pipeline operator to pass the security group in $nsg to Get-AzNetworkSecurityRuleConfig, which gets the security rule configuration named rdp-rule.
-The third command changes the access configuration of rdp-rule to Deny.
+The third command changes the access configuration of rdp-rule to Deny. However, this overwrites the rule and only sets the parameters that are passed to the Set-AzNetworkSecurityRuleConfig function.   NOTE: There is no way to change a single attribute
 
 ### Example 2