Updated chmod permission in README.mdx

[Natfan]

Within Linux's chmod system, +x grants all users access to execute the file, whereas u+x only grants the user who owns the file access to execute it. Provided the user is the one who created the start.sh file, there's no reason why this permission change wouldn't cause issues, but it's good to get into the habit of using "least privilege" when assigning permissions, and I know from personal experience that hosting Minecraft servers can be the start of a career in sysadmining.

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[MiniDigger]

I like the idea of encouraging better habits, maybe we even should actually explain what the command does, i.e. "then run chmod to make the file executable"