[MPlayer-dev-eng] [PATCH] Docs: Correct hyphens to minus signs

[Robbie Harwood]

groff treats '-' to mean hyphen (U+2010) rather than minus (U+002D).
Minus is used for specifying flags (e.g., in "-v"), and so this patch
corrects accidental usage of hyphens in reference to usage flags
within man pages.

Please note that I only speak some of these languages, and so it should
not be assumed that the changes I have made are exhaustive.
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