Fix country selector CSS variable

[goveo]

What has been done

• Fixed usage of the --react-international-phone-dropdown-top CSS variable
• Small docs fix

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
react-international-phone-docs	✅ Ready (Inspect)	Visit Preview	Feb 22, 2024 9:47pm
react-international-phone-storybook	✅ Ready (Inspect)	Visit Preview	Feb 22, 2024 9:47pm

[goveo]

:tada: This PR is included in version 4.2.6 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: