docs: fix grammar and style issues in smart contract anatomy page

[KosiChinaza]

This PR fixes several small grammatical and style issues in the Smart Contracts → Anatomy page:

• Add missing comma “However, address should be new....”
• Standardize list items to lowercase for style consistency
• Replace “dynamically-sized byte arrays” with “dynamically sized byte arrays”

These updates improve clarity and consistency for developers reading the documentation.

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[corwintines]

@all-contributors can you add @KosiChinaza for content

[allcontributors]

@corwintines

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

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