Format code block in documentation

Author: denisebmsft

defender-endpoint/configure-extension-file-exclusions-microsoft-defender-antivirus.md

@@ -39,7 +39,7 @@ You can define exclusions for Microsoft Defender Antivirus that apply to [schedu
 > Microsoft Defender Antivirus exclusions do apply to some Microsoft Defender for Endpoint capabilities, such as [attack surface reduction rules](attack-surface-reduction.md). Some Microsoft Defender Antivirus exclusions are applicable to some ASR rule exclusions. See [Attack surface reduction rules reference - Microsoft Defender Antivirus exclusions and ASR rules](attack-surface-reduction-rules-reference.md#microsoft-defender-antivirus-exclusions-and-asr-rules).
 > Files that you exclude using the methods described in this article can still trigger Endpoint Detection and Response (EDR) alerts and other detections.
 > To exclude files broadly, add them to the Microsoft Defender for Endpoint [custom indicators](indicators-overview.md).
-> Variables, such as %USERPROFILE% aren't interpreted in exclusion settings. We recommend using an explicit path format.
+> Variables, such as `%USERPROFILE%` aren't interpreted in exclusion settings. We recommend using an explicit path format.
 
 ## Before you begin