Thanks for the review. Please go ahead and commit

In D40287#917802, @fernape wrote:

Change points to

https://docs.freebsd.org/en/books/handbook/#kernelconfig-building but I think the proper anchor is:
https://docs.freebsd.org/en/books/handbook/book/#kernelconfig-building

The changes point to https://docs.freebsd.org/en/books/handbook/kernelconfig/#kernelconfig-building