[Bug 752748] validate:launcher: Fix documentation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752748

--- Comment #2 from Vineeth <vineeth.tm at samsung.com> ---
I have a requirement, for creating media-info..

--generate-media-info, creates .media-info files if they are not present.
--update-media-info, updates the .media-info files if already present.

There are cases, where i need to do both --generate-media-info and
--update-media-info... say i have 10 media files in a folder and i generated
the media info for the first time. Now some code has changed, which will need
me to call update media info. And i want to test some more extra media files.
So i added them to the media directory..


I was thinking maybe we can add an extra parameter --clean, which can be used
only with --generate-media-info, which removes all the .media-info files
present and recreates them..

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