fix: typos in documentation files

[kilavvy]

This pull request contains changes to improve clarity, correctness and structure.

Summary by CodeRabbit

• Documentation
  • Made spelling corrections in documentation text to improve clarity and accuracy, including the contract overview and internal descriptions.

[coderabbitai]

Walkthrough

This pull request corrects minor typographical errors in documentation files. In the contracts overview, the term "transfering" is updated to "transferring". Additionally, within the SafeMath library documentation in two Solidity files, "substraction" is corrected to "subtraction". These changes are purely textual and do not affect the functionality or logic of the code.

Changes

File(s)	Change Summary
contracts/README.md	Fixed typo in the L1StandardBridge entry: "transfering" changed to "transferring".
contracts/contracts/libraries/usdc/*.sol.flatten	Corrected spelling in documentation: replaced "substraction" with "subtraction" in the SafeMath library's trySub comments.

Poem

Oh, what joy in every byte,
A bunny hops with pure delight.
Typos vanish in a gentle leap,
Clean words now dance, no longer sleep.
May our docs be ever bright! 🐇
Hooray for clarity in our code's insight!

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between db42adc and 100f446.

📒 Files selected for processing (3)

• contracts/README.md (1 hunks)
• contracts/contracts/libraries/usdc/FiatTokenV2_2.sol.flatten (1 hunks)
• contracts/contracts/libraries/usdc/MasterMinter.sol.flatten (1 hunks)

✅ Files skipped from review due to trivial changes (3)

• contracts/README.md
• contracts/contracts/libraries/usdc/MasterMinter.sol.flatten
• contracts/contracts/libraries/usdc/FiatTokenV2_2.sol.flatten

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