Update Set-TransportRule.md

Author: chrisda

exchange/exchange-ps/exchange/Set-TransportRule.md

@@ -929,13 +929,16 @@ This parameter specifies a condition or part of a condition for the rule. The na
 
 In on-premises Exchange, this condition is only available on Mailbox servers.
 
-Mail flow rules only can inspect the content of supported file types. If the mail flow rule finds an attachment file type that isn't supported, the AttachmentIsUnsupported condition is triggered. Supported file types for an attachment are listed here [Use mail flow rules to inspect message attachments in Exchange Online](/exchange/security-and-compliance/mail-flow-rules/inspect-message-attachments). Valid values are:
+The AttachmentIsUnsupported parameter specifies a condition that looks for unsupported file types in messages. Valid values are:
 
 - $true: Look for unsupported file types in messages.
 - $false: Don't look for unsupported file types in messages.
 
-To extend the list of supported file types in Exchange 2013 set up IFilter.
-For more information, see [Register Filter Pack IFilters with Exchange 2013](https://learn.microsoft.com/exchange/register-filter-pack-ifilters-with-exchange-2013-exchange-2013-help).
+Rules can inspect the content of supported file types only. If the rule finds an attachment file type that isn't supported, the AttachmentIsUnsupported condition is triggered. 
+
+For the list of supported file types, see [Supported file types for mail flow rule content inspection](https://learn.microsoft.com/exchange/security-and-compliance/mail-flow-rules/inspect-message-attachments#supported-file-types-for-mail-flow-rule-content-inspection).
+
+In Exhange 2013, to extend the list of supported file types, see [Register Filter Pack IFilters with Exchange 2013](https://learn.microsoft.com/exchange/register-filter-pack-ifilters-with-exchange-2013-exchange-2013-help).
 
 ```yaml
 Type: Boolean