[8.x] Update docs on task manager default poll interval as of 8.17 (#…

…202559) (#202791)

# Backport

This will backport the following commits from `main` to `8.x`:
- [Update docs on task manager default poll interval as of 8.17
(#202559)](#202559)

<!--- Backport version: 9.4.3 -->

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Co-authored-by: Mike Côté <mikecote@users.noreply.github.com>

docs/settings/task-manager-settings.asciidoc

@@ -17,7 +17,7 @@ Task Manager runs background tasks by polling for work on an interval.  You can
 The maximum number of times a task will be attempted before being abandoned as failed.  Defaults to 3.
 
 `xpack.task_manager.poll_interval`::
-How often, in milliseconds, the task manager will look for more work.  Defaults to 3000 and cannot be lower than 100.
+How often, in milliseconds, the task manager will look for more work.  Defaults to 500 and cannot be lower than 100.
 
 `xpack.task_manager.request_capacity`::
 How many requests can Task Manager buffer before it rejects new requests.  Defaults to 1000.