Minor documentation refinements

[paolodina]

Checklist

• The code has 100% test coverage.
• The documentation was properly created or updated (if applicable) following the correct guidelines and appropriate language.
• I branched out from the latest main or is a sub-branch.

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I feel a bit nitpicky doing a PR like this one, but still... The VSCode code formatter slightly reformatted some parts of the code (just a few). Let me know if these changes are okay. The changes cover the first part of the Esmerald documentation. Apart from punctuation and typos, there are some modifications to the example code where I found discrepancies. I'd like you to particularly check those.

[tarsil]

Fantastic 🎉🎉🎉 thank you so much @paolodina