PostX Gnu/Linux 0.4 release notes updated

I have added some clarifications and also some needed information to PostX Gnu/Linux 0.4 release notes regarding partitioning and  dual booting and UEFI issues (Windows 8 and 10). You can find the revised version of the release notes from the same place as before: https://www.techtimejourney.net/postx-gnulinux-0-4-arrives-32-bit-and-64-bit/