Confusion with 'highest' and 'lowest' in `hierarchy.md`.

[iago-lito]

In this section, "higher" seem to mean "closest from CPU". As suggested by the pyramid picture and sentences like:

Modern CPUs have multiple layers of cache (L1, L2, often L3, and rarely even L4). The lowest layer is shared between cores and is usually scaled with their number (e.g., a 10-core CPU should have around 10M of L3 cache).

However, this logic seems to be reverted in the following?

When accessed, the contents of a cache line are emplaced onto the lowest cache layer and then gradually evicted to higher levels unless accessed again in time.