Fixed typo error venia-pwa-concept/project-structure

[shashidesilva]

Fixed typo error in pwa docs pwa-studio/venia-pwa-concept/project-structure/ document file

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• I have read the CONTRIBUTING document.
• I have linked an issue to this PR.
• I have indicated the change type and relevant package(s).
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
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1 out of 2 committers have signed the CLA.

✅ jcalcaben
❌ shashi

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[jcalcaben]

Hi @shashidesilva
You'll need to sign the Contributor License Agreement before I can merge this PR. Thanks!