Clean up stale documentation audit findings (#10114)

Co-authored-by: Douwe M Osinga <douwe@sidewalklabs.com>

documentation/docs/getting-started/using-extensions.md

@@ -33,13 +33,15 @@ goose operates autonomously by default. Combined with the Developer extension's
 
 ### Built-in Platform Extensions
 
-Platform extensions are built-in extensions that provide global features like conversation search, task tracking, and extension management. These extensions are always available and can be toggled on or off as needed.
+Platform extensions are built-in extensions that provide global features like code analysis, conversation search, task tracking, and extension management. They can be toggled on or off as needed.
 
+- [Analyze](/docs/guides/codebase-analysis): Analyze code structure, file details, and symbol call graphs (enabled by default)
 - [Apps](/docs/mcp/apps-mcp): Create, manage, and launch custom HTML apps in standalone windows
 - [Chat Recall](/docs/mcp/chatrecall-mcp): Search conversation content across all your session history
-- [Code Mode](/docs/mcp/code-mode-mcp): Execute JavaScript code for tool discovery and tool calling
+- [Code Mode](/docs/mcp/code-mode-mcp): Execute JavaScript code for tool discovery and tool calling, when included in the current build
 - [Extension Manager](/docs/mcp/extension-manager-mcp): Discover, enable, and disable extensions dynamically during sessions (enabled by default)
-- [Summon](/docs/mcp/summon-mcp): Load skills and recipes, and delegate tasks to subagents (enabled by default)
+- [Skills](/docs/guides/context-engineering/using-skills): Discover and load skill instructions from built-in and filesystem skills (enabled by default)
+- [Summon](/docs/mcp/summon-mcp): Load knowledge sources and delegate tasks to subagents (enabled by default)
 - [Todo](/docs/mcp/todo-mcp): Manage task lists and track progress across sessions (enabled by default)
 - [Top of Mind](/docs/mcp/tom-mcp): Inject persistent instructions into goose's working memory every turn