I find ReSharper 2017.2.2 identifying a lack of <inheritdoc /> as a Potential Code Quality Issues even when there is nothing to inherit. Consider the below example. The MyException constructor could inherit documentation from the base constructor, but the base constructor only provides a summary. Since the child constructor also provides a summary there is nothing to inherit.
I suggest that ReSharper only suggest <inheritdoc /> when the sub class/method is missing documentation that the parent includes. This would be very handy indeed.
Is it ReSharper guidance that all inherited classes / methods always use <inheritdoc />? I would be interested in more information on the guidance around this issue.