Default macOS filesystem changed from case-insensitive HFS+ to case-insensitive APFS

[asukakenji]

File: docker-for-mac/osxfs.md, CC @gbarr01

In the "Case sensitivity" section, it says the default macOS filesystem is HFS+. However, since macOS 10.12 High Sierra, the default changed to case-insensitive APFS.

Here is the official reference from Apple (go to "How does Apple File System handle filenames"):
https://developer.apple.com/library/content/documentation/FileManagement/Conceptual/APFS_Guide/FAQ/FAQ.html

The same issue occurs again in the section "Symlinks". In this case, the word HFS+ could be deleted to solve the problem.

[docker-robott]

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