[DOCS] Explain MIPS Memory Proofs visually with a diagram

## Brief Description of the Docs Request

The current documentation on MIPS is difficult to follow/ understand.

## Description of the Documentation You'd Like

Add a diagram to visually explain the binary Merkle tree with 27 leaf nodes used in the MIPS Memory Proofs.

## Links to Related Pages

https://docs.optimism.io/stack/protocol/fault-proofs/mips#memory-proof