Remove reduntant word in device-mapper-driver.md
(cherry picked from commit 5c9bcaa9421699eb39df59cf12f9404bd4ebec82)
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@@ -216,7 +216,7 @@ a `direct-lvm` configuration. |
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The procedure below will create a logical volume configured as a thin pool to |
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use as backing for the storage pool. It assumes that you have a spare block |
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device at `/dev/xvdf` with enough free space to complete the task. The device |
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-identifier and volume sizes may be be different in your environment and you |
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+identifier and volume sizes may be different in your environment and you |
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should substitute your own values throughout the procedure. The procedure also |
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assumes that the Docker daemon is in the `stopped` state. |
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