chore: docs fix after swiftlint

[JeneaVranceanu]

Summary of Changes

• Fixed Swift documentation alignment + updated it a bit in extension Web3.Personal;
• Minor spacings update;
• Removed some redundant comments that do not hold any value.

Test Data or Screenshots

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• I have reviewed the Contribution Guidelines.
• I have performed a self-review of my own code.
• I have updated my repository to match the develop branch.
• I have included test data or screenshots that prove my fix is effective or that my feature works.
• I have checked that all tests work and swiftlint is not throwing any errors/warnings.

[JeneaVranceanu]

This format of multiline documentation (using /// instead of /** */) is even used by Apple.
And to me personally, it looks a lot easier to edit.

[yaroslavyaroslav]

While i have no pref about the doc style, i have to say, that this is true only if you're staying within Xcode. All third party editor knows nothing about /// comments, and not prefix it on new line hit.

Actually because i did wrote those comments in Sublime Text i'd choose the given one doc style formatting.