Small typos in README.md

[PQCraft]

Here's a diff

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< [Get the latest Retro Odroid Go Frimware](https://github.com/retro-esp32/Retro-Odroid-Go-Firmware)
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> [Get the latest Retro Odroid Go Firmware](https://github.com/retro-esp32/Retro-Odroid-Go-Firmware)
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< - [x] **3** Scale levels for *'Core'* Emaulators *(Original, Box, Full Screen)*
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> - [x] **3** Scale levels for *'Core'* Emulators *(Original, Box, Full Screen)*
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< Did you know, you can support us in a few way? We offer multiple sposorship tiers, with different rewards!
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> Did you know, you can support us in a few way? We offer multiple sponsorship tiers, with different rewards!