Fix dimension prefix in changelog

CHANGELOG.md

@@ -97,7 +97,7 @@ Internal types are updated to use `scope` instead of `instrumentation_library`.
 * [BUGFIX] New wal file separator '+' for the NTFS filesystem and backward compatibility with the old separator ':' [#1700](https://github.com/grafana/tempo/pull/1700) (@kilian-kier)
 * [ENHANCEMENT] metrics-generator: extract `status_message` field from spans [#1786](https://github.com/grafana/tempo/pull/1786), [#1794](https://github.com/grafana/tempo/pull/1794) (@stoewer)
 * [ENHANCEMENT] metrics-generator: handle collisions between user defined and default dimensions [#1794](https://github.com/grafana/tempo/pull/1794) (@stoewer)
-  **BREAKING CHANGE** Custom dimensions colliding with intrinsic dimensions will be prefixed with `--`.
+  **BREAKING CHANGE** Custom dimensions colliding with intrinsic dimensions will be prefixed with `__`.
 * [ENHANCEMENT] metrics-generator: make intrinsic dimensions configurable and disable `status_message` by default [#1960](https://github.com/grafana/tempo/pull/1960) (@stoewer)
 * [ENHANCEMENT] distributor: Log span names when `distributor.log_received_spans.include_all_attributes` is on [#1790](https://github.com/grafana/tempo/pull/1790) (@suraciii)
 * [ENHANCEMENT] metrics-generator: truncate label names and values exceeding a configurable length [#1897](https://github.com/grafana/tempo/pull/1897) (@kvrhdn)