docs(eslint-plugin): [no-unsafe-member-access] correct example idx from const to let

[BrianDawson]

Update variable declaration from const to let so that code can run. Fixes error: Cannot assign to 'idx' because it is a constant.

PR Checklist

• Addresses an existing open issue: fixes #000
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

[typescript-eslint]

Thanks for the PR, @BrianDawson!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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✅ Successfully ran 19 targets

• nx test eslint-plugin --coverage=false
• nx test type-utils --coverage=false
• nx test eslint-plugin-tslint --coverage=false
• nx run types:build
• nx test typescript-estree --coverage=false
• nx test utils --coverage=false
• nx test repo-tools --coverage=false
• nx test visitor-keys --coverage=false
• nx run repo-tools:postinstall-script
• nx test parser --coverage=false
• nx run-many --target=typecheck --parallel
• nx test scope-manager --coverage=false
• nx test eslint-plugin-internal --coverage=false
• nx test rule-schema-to-typescript-types --coverage=false
• nx run-many --target=lint --parallel
• nx run eslint-plugin:generate:configs
• nx run integration-tests:test
• nx test ast-spec --coverage=false
• nx run-many --target=build --parallel --exclude=website --exclude=website-eslint

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[JoshuaKGoldberg]

Nice catch, thanks!