Document object parameter's default values

[Blackbaud-SteveBrush]

We need to figure out a way to document object-type parameters' default values:

interface Config {
  foo?: string;
}

// How to document the default value for Config.foo?
public foobar(config: Config): void {

Related TypeDoc issue(s):
TypeStrong/typedoc#567

Currently, TypeDoc does not support bracketed defaults for @param tag. It simply ignores everything after the first @param tag.
(Brackets are used by JSDoc to signify defaults, see: https://devhints.io/jsdoc)

/**
 * This is the init function.
 * @param args The init args.
 * - `args.foo` This defaults to 'bar'.
 */
public init(args: FooInitArgs): void { }

[Blackbaud-SteveBrush]

For the time being let's use this format:

/**
 * Some description here. Default values for the `args`:
 * - `args.bar` If you don't set this... The default is `'foobar'`.
 */