Rollback of https://github.com/google/ExoPlayer/commit/95e6db931a047775c1aa792c452be7996167a08f

*** Original commit ***

Add link to annual media developer survey.

This will be removed after the survey has closed in ~1 month.

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PiperOrigin-RevId: 408327757

docs/index.md

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-The Android media team is interested in your experiences with the Android media
-APIs and developer resources. Please provide your feedback by
-[completing this short survey](https://goo.gle/media-survey-6).
-{:.info}
 
 ExoPlayer is an application level media player for Android. It provides an
 alternative to Android’s MediaPlayer API for playing audio and video both