Minor edits to grid transformations guides

[RichardScottOZ]

Fix some words.

I think this might be the clearest highpass/lowpass example I have seen written anywhere!

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[santisoler]

Thanks @RichardScottOZ, nice multiple catches!

I think this might be the clearest highpass/lowpass example I have seen written anywhere!

🤩

I'm merging this!

BTW thanks @Esteban82 for the review!

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