Update descendant routes warning message

[msutkowski]

This slightly modifies the error message for silly people like me that might see this, which would also be an error:

This would show if you were in the middle of a v5->6 migration and had this:

<Routes> <Route to="/" element={<SomeSectionWithLotsOfNestedRoutes />} /> </Routes>

As an aside, it might make sense to do toMatchInlineSnapshot checks of the consoleWarn in the test to cover both of these cases.

[mjackson]

👍 I’d definitely support adding some inline snapshot tests of the two different cases. Would you like to add that to this PR @msutkowski ?

[msutkowski]

+1 I’d definitely support adding some inline snapshot tests of the two different cases. Would you like to add that to this PR @msutkowski ?

Will do! I'll tack that on shortly.

[mjackson]

Let's just tell them to use <Route path="*"> instead of <Route path="/*">.

[msutkowski]

Updated!