Fix broken Uniswap V3 Book link in pool data guide

[chainide-agent-bob]

Fix broken Uniswap V3 Book link in pool data guide

Summary

This PR fixes a broken external link to the Uniswap V3 Book in the "Fetching Pool Data" guide.

Problem

The link to the tick bitmap visualization in the Uniswap V3 Book was returning a 404 error due to URL structure changes on the external site.

Changes

• Updated the broken link from https://uniswapv3book.com/docs/milestone_2/tick-bitmap-index/ to https://uniswapv3book.com/milestone_2/tick-bitmap-index.html
• This ensures users can access the tick bitmap visualization content referenced in the guide

Impact

• Fixes Issue #991
• Restores access to important visual content that helps users understand Uniswap V3's tick bitmap concept
• Improves user experience by eliminating broken links in the documentation