manpage: document using sub-shadow-offset for background sizing

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Ricardo Constantino 2018-01-24 19:33:44 +00:00
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@ -2020,7 +2020,8 @@ Subtitles
Default: 55.
``--sub-back-color=<color>``
See ``--sub-color``. Color used for sub text background.
See ``--sub-color``. Color used for sub text background. You can use
``--sub-shadow-offset`` to change its size relative to the text.
``--sub-blur=<0..20.0>``
Gaussian blur factor. 0 means no blur applied (default).