Add information about reconfiguring Moore after adding new tests.

When adding new tests, make Moore/configure needs to be called to find the tests.

added Documentation label

assigned to @ngrieser

@rmatev Hi could you check this addition to the documentation?

added RTA label

make Moore/configure is also mentioned a bit below the changed lines, but it's a good idea to add it in the list to make it more visible :)

approved this merge request

merged

mentioned in commit 105c3762