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Fix an erratum; s/two/three/

There are three options because the new one was added at 6f863cf.

Signed-off-by: Yi EungJun <eungjun.yi@navercorp.com>
(cherry picked from commit 8c93958fcb1b1fc838c76b08cc4dde4ce37691bb)

Yi EungJun authored on 2016/02/12 18:48:51
Showing 1 changed files
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@@ -421,7 +421,7 @@ Once you have several machines provisioned, you can use Docker Swarm to quickly
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 form them into a swarm which includes a discovery service as well.
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 To create an overlay network, you configure options on  the `daemon` on each
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-Docker Engine for use with `overlay` network. There are two options to set:
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+Docker Engine for use with `overlay` network. There are three options to set:
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 <table>
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     <thead>