docs: update misleading clonefile information

[ImBIOS]

What does this PR do?

Close #5973

• Documentation or TypeScript types (it's okay to leave the rest blank in this case)
• Code changes

How did you verify your code works?

null

[paperclover]

im not 100% sure about this because while clonefile files do not take more space on the disk, they do contribute to the total disk space used (as in, the file is counted twice)

[paperclover]

i think instead of talking about HFS (filesystem that most do not use anymore, and im unsure if Bun even works on these older mac os systems), we should say that clonefile is copy-on-write, meaning it will not ocupy disk space, but it will count towards your drive's limit.

we can also say the copy-on-write behavior is useful because if something attempts to patch node_modules/*, it is impossible to affect other installations. but this is less important than clarifying the disk space issue.

[ImBIOS]

@paperdave updated and ready to review again.