[Security] Update max limit of notes (#3958)

Resolves #3931.

Updates the information on the maximum supported number of notes per
alert/event/Timeline, and adds applies_to tags to the
`securitySolution:maxUnassociatedNotes` advanced setting, which was
removed in elastic/kibana#214922.

Previews:
* [Set the maximum notes limit for alerts and
events](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/3958/solutions/security/get-started/configure-advanced-settings#max-notes-alerts-events)
*
[Notes](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/3958/solutions/security/investigate/notes)

8.19 PR: TBD

Author: natasha-moore-elastic

solutions/security/get-started/configure-advanced-settings.md

@@ -223,6 +223,10 @@ The `securitySolution:alertTags` field determines which options display in the a
 
 
 ## Set the maximum notes limit for alerts and events [max-notes-alerts-events]
+```yaml {applies_to}
+stack: removed 9.1
+serverless: removed
+```
 
 The `securitySolution:maxUnassociatedNotes` field determines the maximum number of [notes](/solutions/security/investigate/notes.md) that you can attach to alerts and events. The maximum limit and default value is 10000.
 

solutions/security/investigate/notes.md

@@ -16,7 +16,8 @@ products:
 Incorporate notes into your investigative workflows to coordinate responses, conduct threat hunting, and share investigative findings. You can attach notes to alerts, events, and Timelines and manage them from the **Notes** page.
 
 ::::{note}
-Configure the `securitySolution:maxUnassociatedNotes` [advanced setting](/solutions/security/get-started/configure-advanced-settings.md#max-notes-alerts-events) to specify the maximum number of notes that you can attach to alerts and events.
+* {applies_to}`stack: ga 9.1` {applies_to}`serverless: ga` You can attach up to 100 notes to alerts and events. The number of notes you can attach to Timelines is unlimited.
+* {applies_to}`stack: removed 9.1` {applies_to}`serverless: removed` Configure the `securitySolution:maxUnassociatedNotes` [advanced setting](/solutions/security/get-started/configure-advanced-settings.md#max-notes-alerts-events) to specify the maximum number of notes that you can attach to alerts and events.
 ::::
 
 ## Grant access to notes [notes-privileges]