Why did "cmake-developer" change its contents since version 3.14?

I noticed that the contents of “cmake-developer” did a big change since version 3.14. Can I ask why CMake Team did this change?

The following contents is of version 3.14:

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The following contents is of version 3.13:

Prior to 3.14, the cmake-developer(7) manual contained a mix of information for developing CMake modules at large, and for development of CMake itself. The latter has moved to Help/dev/ in the source tree and is no longer part of the distributed documentation.