Update corridor.md to fix env name typo

[ouked]

Fix typo for MiniHack-Corridor-R2-v0

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[samvelyan]

Hi @ouked. Thanks a lot of the PR!

Could you please sign the Facebook CLA so that I can merge it? Here's the link https://code.facebook.com/cla.

[ouked]

That's done, cheers :)

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