fix-parsing-error-due-to-duplicate-fields added correct PR number

Author: StacieClark-Elastic

packages/o365/changelog.yml

@@ -7,7 +7,7 @@
         Added fields Messages and Folders as ExchangeMessages and ExchangeFolders 
         for record type 50: `ExchangeItemAggregated`.
       type: bugfix
-      link: https://github.com/elastic/integrations/pull/99999
+      link: https://github.com/elastic/integrations/pull/15699
 - version: "2.31.0"
   changes:
     - description: Improve documentation.