All the documentation below cover both Integrated Edge Cloud Type 1 & 2.
IEC Type 2 API Document for R5
IEC Type 2 Architecture Document for R5
IEC Type 2 Datasheet for R5
IEC Type 2 Installation Guide for R5
IEC Type 2 Release Notes for R5
IEC Type 2 Test Document for R5
Blog of IEC Type 2 Release 5