docs(mcp): add missing --transport http flag to Claude Code command (#661)

The Claude Code CLI requires the --transport http flag when adding HTTP-based
MCP servers. Without it, the URL is interpreted as a stdio command, causing
the connection to fail.

Co-authored-by: Claude Opus 4.5 <[email protected]>

Author: DiegoJohnsonL

docs/mcp/connecting.md

@@ -72,7 +72,7 @@ Restart Claude Desktop. On first use, a browser window will open to authorize ac
 ## Claude Code
 
 ```bash
-claude mcp add tanstack https://tanstack.com/api/mcp
+claude mcp add --transport http tanstack https://tanstack.com/api/mcp
 ```
 
 On first use, a browser window will open to authorize access.