This warning simply means that the target XBRL document contains a formula which produces a warning, for instance if your file gets the warning “formula:assertionunsatisfied”, then it will also receive a Violation: targetXBRLDocumentWithFormulaWarnings.
Luckily, this violation will disappear when you correct the warning in question.
Continuing with the example above, if your report produces the warning "formula:assertionunsatisfied" because there is a missing element, simply adding the missing element in question will also remove the "Violation: targetXBRLDocumentWithFormulaWarnings".
Because the violation in question is related to a warning, it is a non-blocking error, which means you do not necessarily need to correct it.