[struct mount] Outdated locking documentation for mnt_uppers

[Alexander Lochmann]

Hi folks,

I came accross the locking documentation for struct mount.
According to the definition [1], mnt_uppers should be accessed using the 
global mountlist_mtx.
However, the code uses the MNT_ILOCK macro, which uses the mnt_mtx.
Is the locking documentation still valid?
Shouldn't it be updated?

Regards,
Alex

[1] https://github.com/freebsd/freebsd-src/blob/main/sys/sys/mount.h#L246
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