Fix detection in deprecation_mapping

Author: RavenTait

removed/deprecation_mapping.YML

@@ -3,7 +3,7 @@ detections:
     removed_in_version: 5.22.0
     reason: Detection is now part of a larger collection of suspicious named pipes
     replacement_content:
-      - Windows Suspicious Named Pipe
+      - Windows Suspicious C2 Named Pipe
   - content: Windows Default RDP File Creation
     removed_in_version: 5.20.0
     reason: Detections updated to use the new search logic and field names.