docs: align cost tables to 100k scale with fact-checked numbers #108

Job	Run time
basic-operations/anchor/burn	2m 18s
basic-operations/anchor/create-nullifier	2m 11s
counter/anchor	2m 19s
basic-operations/anchor/update	2m 10s
basic-operations/anchor/create	2m 14s
create-and-update	2m 15s
basic-operations/anchor/reinit	2m 10s
basic-operations/anchor/close	2m 20s
	17m 57s

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