config(972430): Added documentation for Markdown support in ChatUI component in Core and Mvc UG#4445

IndrajithSrinivasan merged 2 commits intodevelopmentsyncfusion-content/ej2-asp-core-mvc-docs:developmentfrom

972430-markdownsyncfusion-content/ej2-asp-core-mvc-docs:972430-markdownCopy head branch name to clipboard