ecore_file/ipc: clean up documentation

ecore_file/ipc: clean up documentation

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commit 3b4293ffa334303ccd2de0422d56a21873afcba0
Author: Jee-Yong Um <conr2d@gmail.com>
Date:   Tue Oct 4 21:08:17 2016 +0900

    ecore_file/ipc: clean up documentation

    Summary:
    move comment from c source to header and adjust ingroup relationship

    Reviewers: cedric, jpeg, Hermet

    Reviewed By: Hermet

    Differential Revision: https://phab.enlightenment.org/D4328
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Signed-Off-By: Jee-Yong Um <jc9.um@samsung.com>
Change-Id: Iddccfe0764a8b40a9e00843822c81894eaeac5e5