Add fd section for linux container process

Signed-off-by: Mrunal Patel <[email protected]>
opencontainers · Aug 21, 2015 · 3174a03 · 3174a03
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+## File descriptors
+By default, only the `stdin`, `stdout` and `stderr` file descriptors are kept open for the container process by the runtime.
+The runtime may leak additional file descriptors into the container process to support features such as [socket activation](http://0pointer.de/blog/projects/socket-activated-containers.html).