what-is-monero: improve wording

[erciccione]

closes #2160

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[erciccione]

ci for ruby 2.7 fixed with #2167

[hinto-janai]

The phrase privacy enhancing is usually used to indicate that a given privacy system is practically sufficient but is not "perfect" and may have flaws, so I would keep it.

Although, the next sentence is "ensure the anonymity of its users" so... ¯\(ツ)/¯