Add fd section for linux container process

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>
opencontainers · Aug 28, 2015 · 0b5324b · 0b5324b
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+## File descriptors
+By default, only the `stdin`, `stdout` and `stderr` file descriptors are kept open for the application by the runtime.
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+The runtime may pass additional file descriptors to the application to support features such as [socket activation](http://0pointer.de/blog/projects/socket-activated-containers.html).
+
+Some of the file descriptors may be redirected to /dev/null even though they are open.