Update readme for similar format to other Mailtrap SDKs

[DagonWat]

Motivation

• We need to keep SDKs Readme's in same format and standard

Changes

• Update README.md

[i7an]

The PR description is probably not up to date.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch update-readme-for-similar-format

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[IgorDobryn]

Send emails to your Sandbox for testing purposes:

[i7an]

"So you simply removed a chunk of documentation..."

https://github.com/mailtrap/mailtrap-ruby/pull/79/files#r2640760642

[DagonWat]

that's a nice catch actually, I've used wrong example for multiple clients setup, now setting correct one.