Update understanding_explain_plans.md

doc/development/database/understanding_explain_plans.md

@@ -571,8 +571,8 @@ what if we slightly change the purpose of it? What if instead of retrieving all
 projects with `visibility_level` 0 or 20, we retrieve those that a user
 interacted with somehow?
 
-Fortunately, GitLab has an answer for this, and it's a table called
-`user_interacted_projects`. This table has the following schema:
+Prior to GitLab 16.7, GitLab used a table named `user_interacted_projects` to track user interactions with projects.
+This table had the following schema:
 
 ```sql
 Table "public.user_interacted_projects"