Remove Starter references from Notes API page

Remove the references to the Starter tier from the Notes API doc.

doc/api/notes.md

@@ -4,7 +4,7 @@ group: Project Management
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 ---
 
-# Notes API
+# Notes API **(FREE)**
 
 Notes are comments on:
 
@@ -19,15 +19,15 @@ assignee changes, GitLab posts a system note).
 ## Resource events
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/38096) in GitLab 13.3 for state, milestone, and weight events.
-> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/40850) in [GitLab Starter](https://about.gitlab.com/pricing/) 13.4 for iteration events.
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/40850) in GitLab 13.4 for iteration events.
 
 Some system notes are not part of this API, but are recorded as separate events:
 
 - [Resource label events](resource_label_events.md)
 - [Resource state events](resource_state_events.md)
 - [Resource milestone events](resource_milestone_events.md)
-- [Resource weight events](resource_weight_events.md) **(STARTER)**
-- [Resource iteration events](resource_iteration_events.md) **(STARTER)**
+- [Resource weight events](resource_weight_events.md)
+- [Resource iteration events](resource_iteration_events.md)
 
 ## Notes pagination