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Correct the description of --group-add in run.md

Signed-off-by: Lei Jitang <leijitang@huawei.com>
(cherry picked from commit 9a7f2e726885386f57d115f8652b0ae87b20dce6)

Lei Jitang authored on 2016/04/06 22:52:10
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@@ -1056,7 +1056,7 @@ Both flags take limits in the `<device-path>:<limit>` format. Both read and
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 write rates must be a positive integer.
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 ## Additional groups
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-    --group-add: Add Linux capabilities
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+    --group-add: Add additional groups to run as 
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 By default, the docker container process runs with the supplementary groups looked
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 up for the specified user. If one wants to add more to that list of groups, then