Wrong information in Handy (Atari Lynx)'s docs

[Auster-South-Anemoi]

Describe the bug
The page mentions the BIOS image is optional for emulating Atari Lynx games.

Expected behavior/changes
The BIOS is actually required for emulating these games.

Additional context
Doc page: https://docs.libretro.com/library/handy/#bios

[fpscan]

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