chore: clarify migration steps in changelog (#99)

Author: porcellus

CHANGELOG.md

@@ -21,7 +21,7 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
       select CONCAT('s-', created_at_time) as key_id, value as key_string, 'RS256' as algorithm, created_at_time as created_at
       from session_access_token_signing_keys;
     ```
-- If using `access_token_signing_key_dynamic` true in the core:
+- If using `access_token_signing_key_dynamic` true (or not set) in the core:
   - `ALTER TABLE session_info ADD COLUMN use_static_key BOOLEAN NOT NULL DEFAULT(false);`
 
 ## [2.4.0] - 2023-03-30