fix: remove doubled word in ethereum-for-web2-auth tutorial

[Oreemo]

Description

Fixed a typo in the "Using Ethereum for web2 authentication" tutorial where "a a" appeared instead of "a" on line 40.

Changes:

• File: public/content/developers/tutorials/ethereum-for-web2-auth/index.md
• Line: 40
• Change: Users have a a private key → Users have a private key

Related Issue

N/A - This is a simple typo fix that doesn't require a prior issue.

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[corwintines]

@all-contributors can you add @Oreemo for content

[allcontributors]

@corwintines

I've put up a pull request to add @Oreemo! 🎉

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