Small documentation issue I ran into while writing a custom job type
The exec command takes an `exe` parameter, similar to other commands,
but the documentation wrongly indicates the parameter should be `exec`.
Reviewed-on: https://projects.blender.org/studio/flamenco/pulls/104396
The docs listed the ffmpeg command as `create-video` but it seems that the actual command is `frames-to-video`.
Reviewed-on: https://projects.blender.org/studio/flamenco/pulls/104333
Reviewed-by: Sybren A. Stüvel <sybren@blender.org>
