doc: Document quirks of the transcoding pipeline (#275)
doc: Document quirks of the transcoding pipeline (#275)

Co-authored-by: Ivan Poleshchuk <9ad2456ebe35766128739071a7eb9bddcb901244@outlook.com>
Co-authored-by: Jai Luthra <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@jailuthra.in>
livepeer/lpms,livepeer/lpms,livepeer/lpms,livepeer/lpms