TSDoc @example tag is improperly handled in previews

[Gerrit0]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: f7bdb7c
• OS Version: All

Steps to Reproduce:

1. Create a TypeScript file with the following valid TSDoc content:

   /**
    * @example
    * TSDoc-like example tag
    * ```js
    * void foo();
    * ```
    */
   function test() {
       //
   }

2. Hover over the declaration for test
   

This should be handled in the same way as if the text was wrapped in <caption> as required by JSDoc

/**
 * @example <caption>TSDoc-like example tag</caption>
 * ```js
 * void foo();
 * ```
 */
function test() {
    //
}