Update overlayfs-driver.md

Update "referred to a" to "referred to as a"
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Maria Bermudez 2018-09-25 07:52:16 -07:00 committed by GitHub
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@ -269,7 +269,7 @@ for `overlay2`.
OverlayFS layers two directories on a single Linux host and presents them as
a single directory. These directories are called _layers_ and the unification
process is referred to as _union mount_. OverlayFS refers to the lower directory
process is referred to as a _union mount_. OverlayFS refers to the lower directory
as `lowerdir` and the upper directory a `upperdir`. The unified view is exposed
through its own directory called `merged`.