Fix changelog

Author: prymitive

docs/changelog.md

@@ -2,10 +2,8 @@
 
 ## v0.77.0
 
-### Fixed
+### Added
 
-- For queries using binary expressions between two vectors Prometheus will remove the metric name
-  from resulting series, pint will now also apply the same logic when checking queries.
 - The [promql/impossible](checks/promql/impossible.md) check will now warn about aggregations and
   and binary operations that try to operate on labels that are already removed in the query.
   Example:
@@ -18,7 +16,12 @@
   The above tries to join two series on the `cluster` label, but `sum(...)` already removed labels
   from the results on both side, so there will be no such label on join on.
 - The [promql/impossible](checks/promql/impossible.md) check will now warn about label joins
-  using `group_left(...)` and `group_right(...)` that are not used in any way.
+  using `group_left(...)` and `group_right(...)` that are not possible or not used in any way.
+
+### Fixed
+
+- For queries using binary expressions between two vectors Prometheus will remove the metric name
+  from resulting series, pint will now also apply the same logic when checking queries.
 
 ## v0.76.1