Mention of file size for Uploading image via Kibana dashboard Image p…

…anels

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

docs/user/dashboard/create-visualizations.asciidoc

@@ -33,6 +33,8 @@ Use one of the editors to create visualizations of your data. Each editor offers
 | <<add-image,Image>>
 | Personalize your dashboard with custom images
 
+`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
+
 | <<dashboard-links,Links>>
 | Add links to other dashboards or to external websites