fix: correct typo in quickstart/user.mdx (modelcontextprotocol#137)

Author: hiroakis

quickstart/user.mdx

@@ -98,7 +98,7 @@ If you get an error saying "command not found" or "node is not recognized", down
 <Tip>
 **How does the configuration file work?**
 
-This configuration file tells Claude for Dekstop which MCP servers to start up every time you start the application. In this case, we have added one server called "filesystem" that will use the Node `npx` command to install and run `@modelcontextprotocol/server-filesystem`. This server, described [here](https://github.com/modelcontextprotocol/servers/tree/main/src/filesystem), will let you access your file system in Claude for Desktop.
+This configuration file tells Claude for Desktop which MCP servers to start up every time you start the application. In this case, we have added one server called "filesystem" that will use the Node `npx` command to install and run `@modelcontextprotocol/server-filesystem`. This server, described [here](https://github.com/modelcontextprotocol/servers/tree/main/src/filesystem), will let you access your file system in Claude for Desktop.
 </Tip>
 
 <Warning>
@@ -241,4 +241,4 @@ npm install -g npm
   >
     Now build your own custom server to use in Claude for Desktop and other clients
   </Card>
-</CardGroup>
+</CardGroup>