Support JSDoc `<caption>` tags for IntelliSense

[mjbvz]

Editor behavior regression from 6.0

In IntelliSense, support for <caption> is currently missing. Example from https://github.com/microsoft/vscode/issues/282530 with @example tags:

declare interface TestInterface {
    /**
     * This is a test.
     * @example <caption>This is on one line.</caption>
     * let a = 0;
     * @example <caption>This is on
     * two lines.</caption>
     * let b = 1;
     */
    testProperty: string;
}

VS Code supports the first case (single line) but it sounds like we should support multiline cases too