Fix broken link in client.mdx and server.mdx (modelcontextprotocol#167)

* Fix link in server.mdx

The link to "Building MCP with LLMs" is broken. Fixing it to point to the correct path `/tutorials/building-mcp-with-llms`

* Fix the broken link in client.mdx

Author: vlttnv

quickstart/client.mdx

@@ -799,7 +799,7 @@ If you see:
 <Tab title="Java">
 
 <Note>
-This is a quickstart demo based on Spring AI MCP auto-configuration and boot starters. 
+This is a quickstart demo based on Spring AI MCP auto-configuration and boot starters.
 To learn how to create sync and async MCP Clients manually, consult the [Java SDK Client](/sdk/java/mcp-client) documentation
 </Note>
 
@@ -925,14 +925,14 @@ Key features:
 - Maintains conversation memory using InMemoryChatMemory
 - Runs as an interactive command-line application
 
-### Build and run 
+### Build and run
 
 ```bash
 ./mvnw clean install
 java -jar ./target/ai-mcp-brave-chatbot-0.0.1-SNAPSHOT.jar
 ```
 
-or 
+or
 
 ```bash
 ./mvnw spring-boot:run
@@ -990,7 +990,7 @@ This provides similar functionality but uses a WebFlux-based SSE transport imple
   <Card
     title="Building MCP with LLMs"
     icon="comments"
-    href="/building-mcp-with-llms"
+    href="/tutorials/building-mcp-with-llms"
   >
     Learn how to use LLMs like Claude to speed up your MCP development
   </Card>

quickstart/server.mdx

@@ -1165,7 +1165,7 @@ For more advanced troubleshooting, check out our guide on [Debugging MCP](/docs/
   <Card
     title="Building MCP with LLMs"
     icon="comments"
-    href="/building-mcp-with-llms"
+    href="/tutorials/building-mcp-with-llms"
   >
     Learn how to use LLMs like Claude to speed up your MCP development
   </Card>