bug: broken url

[Not-Sarthak]

Broken Documentation URL on The Graph's Website

Problem

The URL https://thegraph.com/docs/en/cookbook/upgrading-a-subgraph/ is broken and returns a 404 error.

Steps to Reproduce

1. Navigate to the mentioned URL from https://thegraph.com/docs/en/network/benefits/
2. Observe 404 error page

Expected Behavior

Functional documentation link for subgraph upgrading instructions

Suggested Action

• Verify correct URL for subgraph upgrading documentation
• Restore or redirect to correct page
• Update internal links referencing this URL

Additional Context

Broken documentation links can hinder developer workflow and understanding