Fix layout of second-level list items

Second-level list items in an enumerated list only have proper hanging indentation if we use automatic numbering (1, 1, 1) rather than letters (a, b, c).

Author: garycentric

defender-endpoint/microsoft-defender-antivirus-compatibility.md

@@ -171,11 +171,11 @@ Defender for Endpoint affects whether Microsoft Defender Antivirus can run in pa
 
 2. When Microsoft Defender Antivirus is in passive mode, scans aren't scheduled. If scans *are* scheduled in your configuration, the schedule is ignored. Unless:
 
-   a. "Start the scheduled scan only when computer is on but not in use" is set to "Not configured or enabled". A Windows Task Scheduler is created unless you set "Start the scheduled scan only when computer is on but not in use" to disabled.
+   1. "Start the scheduled scan only when computer is on but not in use" is set to "Not configured or enabled". A Windows Task Scheduler is created unless you set "Start the scheduled scan only when computer is on but not in use" to disabled.
 
-   b. "Turn on catch-up quick scan" is set to "Not configured or enabled". Every 30 days (default number of days) a quick catchup scan continues to occur unless "Turn on catch-up quick scan" is set to disabled. Scan tasks that are set up in Windows Task Scheduler continue to run according to their schedule. If you have scheduled tasks, you can remove them, if preferred.
+   1. "Turn on catch-up quick scan" is set to "Not configured or enabled". Every 30 days (default number of days) a quick catchup scan continues to occur unless "Turn on catch-up quick scan" is set to disabled. Scan tasks that are set up in Windows Task Scheduler continue to run according to their schedule. If you have scheduled tasks, you can remove them, if preferred.
 
-   c. "Turn on scan after security intelligence update" is set to "Not configured or enabled". By default, a quick scan occurs after a "Security Intelligence Update" unless you set "Turn on scan after security intelligence update" to disabled.
+   1. "Turn on scan after security intelligence update" is set to "Not configured or enabled". By default, a quick scan occurs after a "Security Intelligence Update" unless you set "Turn on scan after security intelligence update" to disabled.
 
 3. When Microsoft Defender Antivirus is in passive mode, it doesn't remediate threats. However, [Endpoint detection and response (EDR) in block mode](edr-in-block-mode.md) can remediate threats. In this case, you might see alerts showing Microsoft Defender Antivirus as a source, even when Microsoft Defender Antivirus is in passive mode.