[french_revolution] [greek_square] [inflation_history] Tom's edits for July

[mmcky]

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This PR updates the lecture with edits by @thomassargent30

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[mmcky]

@HumphreyYang would you mind to review the merge conflicts that are being reported.

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[HumphreyYang]

Hi @mmcky,

I just made some small changes to fix very minor typos and make some symbols closer to the style guide.

I think it is ready for your review and merge.

Many thanks in advance.

[HumphreyYang]

Many thanks @mmcky, just updated based on your review.

[mmcky]

thanks @HumphreyYang this is building now so I will merge.