Update full node size in whitepaper and add source so reader can see current state at time of reading

[johnnieskywalker]

In Ethereum whitepaper there's statement that was not updated for 11 years

The Merkle tree protocol is arguably essential to long-term sustainability. A "full node" in the Bitcoin network, one that stores and processes the entirety of every block, takes up about 15 GB of disk space in the Bitcoin network as of April 2014, and is growing by over a gigabyte per month.

I suggest to update it and add trustworthy source for full node size if reader wants to dig deeper.

Suggested update:

A "full node" in the Bitcoin network, which stores and processes the entirety of every block, requires approximately 600 GB of disk space as of April 2025, growing by roughly 50-60 GB per year due to the consistent addition of new blocks.