[FFmpeg-trac] #5252(documentation:new): filters document some typos

[FFmpeg]

#5252: filters document some typos
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             Reporter:  nicol        |                     Type:  defect
               Status:  new          |                 Priority:  minor
            Component:               |                  Version:  git-
  documentation                      |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 ref
 https://github.com/FFmpeg/FFmpeg/blob/0384e3d5dfe16f87e40f948ee42e4697ed7442b6/libavfilter/avf_showspectrum.c#L110
 ref https://ffmpeg.org/ffmpeg-filters.html#showspectrum-1

 Scale option showspectrum filter setting that documentation order is lin,
 sqrt, cbrt, 4thrt, 5thrt, log. But avf_showspectrum.c order is sqrt, cbrt,
 4thrt, 5thrt, log, lin.

 and two typos.

 https://github.com/FFmpeg/FFmpeg/blob/master/doc/filters.texi#L8736

 {{{
 - @item ft
 + @item tf
 Use both fields, top first.
 - @item fb
 + @item bf
 }}}


 ref
 https://github.com/FFmpeg/FFmpeg/blob/master/libavfilter/vf_nnedi.c#L117

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Ticket URL: <https://trac.ffmpeg.org/ticket/5252>
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