Add note about scopes on assignment

[ckaznocha]

closes #33

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testdata/main.go:341

• [nitpick] The comment is too verbose and could be simplified for clarity. Suggestion: 'for loop can be changed to use an integer range (Go 1.22+). Ensure side effects are intentional.'

for i = 0; i < 10; i++ { // want `for loop can be changed to use an integer range \(Go 1\.22\+\)\nBecause the key is not part of the loop's scope, take care to consider side effects.`