(AzureCXP) fixes MicrosoftDocs/azure-docs#319921

Updated line no: 151
From: Use summary rule results for longer in investigations, hunting, and compliance activities.
To: Use summary rule results for longer periods in investigations, hunting, and compliance activities.

Author: TPavanBalaji

articles/sentinel/whats-new.md

@@ -148,7 +148,7 @@ Microsoft Sentinel now provides the ability to create dynamic summaries using [A
 
 - Access summary rule results via Kusto Query Language (KQL) across detection, investigation, hunting, and reporting activities.
 - Run high performance Kusto Query Language (KQL) queries on summarized data.
-- Use summary rule results for longer in investigations, hunting, and compliance activities.
+- Use summary rule results for longer periods in investigations, hunting, and compliance activities.
 
 For more information, see [Aggregate Microsoft Sentinel data with summary rules](summary-rules.md).