Merge pull request rails#50599 from p8/activerecord/explain-changelog

Name all supported methods in `explain` CHANGELOG entry

Author: rafaelfranca

activerecord/CHANGELOG.md

@@ -1,4 +1,4 @@
-*   Add `explain` support for `last`, `pluck` and `count`
+*   Add `explain` support for methods like `last`, `pluck` and `count`
 
     Let `explain` return a proxy that delegates these methods:
 
@@ -12,6 +12,10 @@
     # ...
     ```
 
+    The supported methods are `pluck`, `first`, and `last`, as well as the
+    calculation methods: `average`, `count`, `maximum`,
+    `minimum`, and `sum`.
+
     *Petrik de Heus*
 
 *   Validate using `:on` option when using `validates_associated`