[DOCS] Adding a known issue for 8.13 (#179471)

Adding a known issue to the 8.13 release notes. Canvas workpad is
displaying a toast notification stating image rendering failed.

![Screenshot 2024-03-26 at 17 23
26](b29948e1-271b-4bd5-8353-cee52b19bc3f)

Relates to: #179457

---------

Co-authored-by: Nick Peihl <nickpeihl@gmail.com>
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@ -66,6 +66,19 @@ Review important information about the {kib} 8.x releases.
For information about the {kib} 8.13.0 release, review the following information.
[float]
[[known-issues-8.13.0]]
=== Known issues
[discrete]
[[known-179457]]
.In Canvas, an empty text element incorrectly triggers a toast notification
[%collapsible]
====
*Details* +
In Canvas, an empty text element incorrectly triggers a "Markdown content is required in [readOnly] mode" toast notification. For more information, refer to ({kibana-pull}179457[#179457]).
====
[float]
[[breaking-changes-8.13.0]]
=== Breaking changes