Community
Participate
Working Groups
The migration webpage links to documents in git. See how this looks when you click any of the links here: https://www.eclipse.org/eclipse/development/porting/eclipse_4_17_porting_guide.html
My navigation was as follows: https://download.eclipse.org/eclipse/downloads/drops4/R-4.17-202009021800/ > Eclipse Project 4.17 Readme > Compatibility of Release 4.17 with 4.16 > Eclipse 4.17 Plug-in Migration Guide.