chore(docs): Fix typo in 'eslint-plugin-jsx-a11y'

[jaydattc]

Description

Name of plugin 'eslint-plugin-jsx-a11y' is misspelled as 'eslint-jsx-plugin-a11y', which can confuse readers as the package does not exist on npm's package repository.

Documentation

https://www.gatsbyjs.org/docs/making-your-site-accessible/#linting-with-eslint-jsx-plugin-a11y

Related Issues

[LekoArts]

Thanks for catching that! 👍

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