The FindVTK module only existed to help find_package(VTK) calls work in old projects written to use "USE_VTK_FILE" instead of "VTK_USE_FILE". Drop it to allow find_package(VTK) calls to search for VTKConfig.cmake directly.
Run the convert-help.bash script to convert documentation: ./convert-help.bash "/path/to/CMake-build/bin" Then remove it.