Update spaces-gpus.md (#689)
* Update spaces-gpus.md
Per slack convo with @osanseviero, adding a section on Spaces Community GPU Grants.
* Update spaces-gpus.md
Added screenshot of community gpu grant
* Update docs/hub/spaces-gpus.md
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Co-authored-by: Simon Brandeis <33657802+SBrandeis@users.noreply.github.com>