The standard does not use the term "required documentation" and it can refer to all documents and records required by the standard. The term "required documented process" refers to mandatory documented procedures required by the standard.
Besides the term "documented process", IATF 16949 uses the term "documented information", the same as ISO 9001. There are two phrases where this term is used and they mean different kind of documented information. The first is "maintain documented information" and this refers to different documents such as Quality Policy and QUality Objectives and the second is "retain documented information as an evidence" which means that you need to produce some kind of record, for example record of risk analysis.