NIST breaks these URLs so often it's unclear if it's worth including
them. If they do it again it might be a signal to remove them all.
However, until then, this change updates many of them. Some were deleted
because the format of the anchors has been switched and all the section
numbers remove, and I don't think it's worth trying to unpick all that.
Change-Id: I31457c225e68ee44d383a5a148fdcc80a3430864
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/47464
Commit-Queue: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: David Benjamin <davidben@google.com>