docs: fix links to mcp toolbox (#150)

Co-authored-by: Twisha Bansal <58483338+twishabansal@users.noreply.github.com>

Author: Yuan325

DEVELOPER.md

@@ -61,7 +61,7 @@ be successfully installed by the Gemini CLI.
 
 Currently, there are no automated unit or integration test suites
 within this repository. All functional testing must be performed manually. All tools
-are currently tested in the [MCP Toolbox GitHub](https://github.com/googleapis/genai-toolbox).
+are currently tested in the [MCP Toolbox GitHub](https://github.com/googleapis/mcp-toolbox).
 
 ### Other GitHub Checks
 
@@ -102,7 +102,7 @@ The release process is automated using `release-please`. It consists of an autom
 #### Automated Changelog Enrichment
 
 Before a Release PR is even created, a special workflow automatically mirrors
-relevant changelogs from the core `googleapis/genai-toolbox` dependency. This
+relevant changelogs from the core `googleapis/mcp-toolbox` dependency. This
 ensures that the release notes for this extension accurately reflect important
 upstream changes.