Fixed ambiguity

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cc: @yelevin

Author: yelevin

articles/sentinel/near-real-time-rules.md

@@ -46,7 +46,7 @@ The following limitations currently govern the use of NRT rules:
 
     1. Queries can run only within a single workspace. There is no cross-workspace capability.
 
-    1. There is no event grouping. NRT rules produce a single alert that groups all the applicable events.
+    1. Event grouping is not configurable. NRT rules produce a single alert that groups all the applicable events.
 
 ## Next steps