Mention Proton VPN number of countries available in their free plan.

[rollsicecream]

Changes proposed in this PR:

• Mention Proton VPN countries available in their free plan. The 'VPN' page does mention there's a free plan for Proton VPN and also does mention the number of countries for the paid plan, but it mentions nothing about the number of countries for the free plan.

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[rollsicecream]

Oops, I made a mistake, so please @dngray re-approve this pull request.