Fix grammar in ethers target READMEs

[Zentex1337]

Summary

• Fixed grammar in target-ethers-v5 and target-ethers-v6 READMEs
• Changed handled a bit different to handled a bit differently
• Changed does not extends to does not extend

Test plan

• No code changes, documentation fix only

[changeset-bot]

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Latest commit: 2f44235

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