Update processing.md (#29433)

This flag is supported now

Co-authored-by: Alicia Scott <[email protected]>

Author: PSeitz-dd

content/en/cloudprem/processing.md

@@ -131,7 +131,7 @@ CloudPrem processing is designed to align closely with cloud-based [Datadog Log
 Ignored processors appear as a warning in the indexer logs.
 
 ### Supported Processors:
-- attribute-remapper (overrideOnConflict is unsupported)
+- attribute-remapper
 - category-processor
 - date-remapper
 - grok-parser (limited compatibility)