[Doc] Sync reference servers

This PR synchronizes with the reference servers from
https://github.com/modelcontextprotocol/servers?tab=readme-ov-file#-reference-servers.

The following page will be updated:
https://modelcontextprotocol.io/examples#current-reference-servers

Author: koic

docs/examples.mdx

@@ -11,10 +11,13 @@ These official reference servers demonstrate core MCP features and SDK usage:
 
 ### Current reference servers
 
+- **[Everything](https://github.com/modelcontextprotocol/servers/tree/main/src/everything)** - Reference / test server with prompts, resources, and tools
+- **[Fetch](https://github.com/modelcontextprotocol/servers/tree/main/src/fetch)** - Web content fetching and conversion for efficient LLM usage
 - **[Filesystem](https://github.com/modelcontextprotocol/servers/tree/main/src/filesystem)** - Secure file operations with configurable access controls
-- **[Fetch](https://github.com/modelcontextprotocol/servers/tree/main/src/fetch)** - Web content fetching and conversion optimized for LLM usage
+- **[Git](https://github.com/modelcontextprotocol/servers/tree/main/src/git)** - Tools to read, search, and manipulate Git repositories
 - **[Memory](https://github.com/modelcontextprotocol/servers/tree/main/src/memory)** - Knowledge graph-based persistent memory system
-- **[Sequential Thinking](https://github.com/modelcontextprotocol/servers/tree/main/src/sequentialthinking)** - Dynamic problem-solving through thought sequences
+- **[Sequential Thinking](https://github.com/modelcontextprotocol/servers/tree/main/src/sequentialthinking)** - Dynamic and reflective problem-solving through thought sequences
+- **[Time](https://github.com/modelcontextprotocol/servers/tree/main/src/time)** - Time and timezone conversion capabilities
 
 ### Archived servers (historical reference)