build.md should mention if Qt6 is supported or not
build.md says "optional dependencies: Qt5, Version 5.12 or newer"
When saying "Qt5", is this exclusionary to Qt6? Or is the document older and it means to exclude Qt4?
For people like me that are building Paraview for the first time, and know absolutely nothing about Qt and its version scheme, it would be nice to add a sentence to address Qt6 compatibility.