docs: Corrected Repetition in Contracts Section Update README.md

[mdqst]

Motivation

While reviewing the documentation, I noticed an unnecessary repetition of the word "contracts" in the following sentence:

"The [v3.1 contracts](https://github.com/farcasterxyz/contracts/releases/tag/v3.1.0) contracts were reviewed by [0xMacro](https://0xmacro.com/) and [Cyfrin](https://www.cyfrin.io/)."

I have updated the sentence to eliminate the redundancy, so it now reads:

"The [v3.1 contracts](https://github.com/farcasterxyz/contracts/releases/tag/v3.1.0) were reviewed by [0xMacro](https://0xmacro.com/) and [Cyfrin](https://www.cyfrin.io/)."

Thanks for considering this update!

Merge Checklist

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• The PR title adheres to the conventional commits standard
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PR-Codex overview

This PR focuses on refining the language in the README.md file regarding the audits of the v3.1 and v3.0 contracts. It removes redundant wording for clarity.

Detailed summary

• Changed "contracts were reviewed by" to "were reviewed by" for v3.1 contracts.
• Changed "contracts were reviewed by" to "were reviewed by" for v3.0 contracts.

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