Fix calculation formula for gas fees in ja/MEV [#11782]

[nakmr]

Corrected the incorrect gas fees calculation formula in the Japanese-translated "MAXIMAL EXTRACTABLE VALUE (MEV)" article, changing it from 'gas price ÷ gas used' to 'gas price × gas used'.

Description

Corrected the calculation formula for "gas fees" mentioned in the article "MAXIMAL EXTRACTABLE VALUE (MEV)" that was translated into Japanese, as it was incorrect as follows:

Incorrect
gas fees = gas price ÷ gas used
Correct
gas fees = gas price × gas used

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[corwintines]

Thanks @nakmr

[corwintines]

@all-contributors can you add @nakmr for content

[allcontributors]

@corwintines

I've put up a pull request to add @nakmr! 🎉

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