Add db:migrate to 8.0 Release Note Notable Changes

Since issues are still being opened about it

Author: skipkayhil

guides/source/8_0_release_notes.md

@@ -133,6 +133,9 @@ Please refer to the [Changelog][active-record] for detailed changes.
 
 ### Notable changes
 
+*   Running `db:migrate` on a fresh database now loads the schema before running
+    migrations. (The previous behavior is available as `db:migrate:reset`)
+
 Active Storage
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