Mention of file size for Uploading image via Kibana dashboard Image panel.

[aakash742]

Summary

As per the source code 10MiB is hardcoded limit for image upload in Kibana dashboard Image panels. And it's good to be evident in public documentation also.

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[leemthompo]

@aakash742 couple of issues here:

• I suggest you flag this limitation in the page that's linked in this table (Kibana dashboard Image panels), rather than in the table itself.
• Found some typos and you've left a comment in the text
• I don't know if we need to link to the source code

[leemthompo]

Suggested change

	`Important: 10MiB is hardcoded limit for image upload.` <<<<<<<<<<<<<<< It's good to have this explicitely mentioned in the documentation. See https://github.com/elastic/kibana/blob/ed6a1a4e45e95b775bc3861c8cdbf06804c0e4af/src/plugins/files/common/default_image_file_kind.ts#L15
	[IMPORTANT]
	====
	Image uploads are limited to 10 MiB.
	====

Here's how I'd phrase it, and I'd put it in the file being linked to rather than the table.

[aakash742]

Opened with correct page - #205140