Steps in validation of documents

As far as I understand your question, top management must determine who has the authority to approve each document relevant for the quality management system.

So, validating a QMS document requires its approval by an authorized person. Please consider this article - Some tips to make Document Control more useful for your QMS - https://advisera.com/9001academy/blog/2014/05/20/tips-make-document-control-useful-qms/ - with the main steps for controlling documents

You can find more information about documents and records below:

• How to structure quality management system documentation - https://advisera.com/9001academy/knowledgebase/how-to-structure-quality-management-system-documentation/
• New approach to document and record control in ISO 9001:2015 - https://advisera.com/9001academy/blog/2015/06/30/new-approach-to-document-and-record-control-in-iso-90012015/
• Free online training ISO 9001:2015 Foundations Course - https://advisera.com/training/iso-9001-foundations-course/
• Book - Managing ISO Documentation: A Plain English Guide - https://advisera.com/books/managing-iso-documentation-plain-english-guide/