check-param-names: check duplicate nested names

[brettz9]

Currently, check-param-names doesn't check for duplicates like this:

/**
 * @param {PlainObject} cfg
 * @param {boolean} [cfg.licenses]
 * @param {string} [cfg.licenses]
 * @param {Map} [cfg.licenses=new Map()]
*/

[gajus]

🎉 This issue has been resolved in version 20.0.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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