mount_namespaces.7: Use correctly the terms "mount" and "mount point"

mount_namespaces.7: Use correctly the terms "mount" and "mount point"

On Sun, Nov 17, 2024 at 16:12:24 +0100, Michael Kerrisk wrote:
>
> A "mount" is a tuple consisting of:
> * a mount ID
> * a source (e.g., a device)
> * a target or "mount point" (i.e. a path name)
> * the ID of the parent of this mount
> * other stuff (e.g., options)

Reported-by: Helge Kreutzmann <debian@helgefjell.de>
Cc: Jakub Wilk <jwilk@jwilk.net>
Acked-by: "Michael T. Kerrisk" <mtk.manpages@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>