Update docs/product/crons/monitor-details.mdx

Author: lizokm

docs/product/crons/monitor-details.mdx

@@ -29,7 +29,7 @@ Sentry's Cron Monitoring can notify you and store a timeline of the following ch
 - **Unknown check-in:** In rare cases, Sentry may be unable to identify a check-in status due to an outages or maintenance period.
 
 
-## Monitor State
+## Monitor States
 
 A monitor can have three states: active, muted, and disabled. Only disabled monitors do not count towards your plan's monitor limit.