docs(inputs.netflow): update CHANGELOG.md to provide more insight abo…

…ut the breaking change

Co-authored-by: Sven Rebhan <36194019+srebhan@users.noreply.github.com>

CHANGELOG.md

@@ -1,11 +1,14 @@
 <!-- markdownlint-disable MD024 -->
 # Changelog
 
-## v1.33.2 [2025-01-17]
+## Unreleased
 
 ### Important Changes
 
-- `ip_version` field of the NetFlow input plugin (while using sFlowV5 protocol) will now consistently return values as text. The possible values will be "IPv4", "IPv6", or "unknown". Previously, this field could return inconsistent results, sometimes as text and other times as a numeric value. This change aims to enhance clarity and reliability in the data output.
+- PR [#16403](https://github.com/influxdata/telegraf/pull/16403) ensures consistency of the NetFlow plugin's
+  `ip_version` field type by enforcing "IPv4", "IPv6", or "unknown" string values. Previously the `ip_version` could
+  become an (unsigned) integer when parsing raw-packets' headers especially with SFlow v5 input. Please watch
+  out for type-conflicts on the output side!
 
 ## v1.33.1 [2025-01-10]