[alias-server] Remove irrelevant comments

Summary:
T3060

Depends on D13605

Comments from chronik documentation not relevant to this codebase, removed

Test Plan: Confirm it's just deleted comments, npm test

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D13606