Detection of JSDoc optional parameters and arrays

[Elarcis]

The grammar highlights jsdoc, but fails to recognize optional parameters.

This might be related to microsoft/TypeScript#6810, see there for examples of unrecognized syntaxes.

Edit: It also has a hard time recognizing array types:

/**
 * @param {string} value
 * @param {string[]} arrayValue
 * @param {string} [optionalValue]
 */
function test(value: string, arrayValue: string[], optionalValue?: string) {

}