Fix broken links

Author: eiriktsarpalis

docs/concepts/tasks/tasks.md

@@ -457,7 +457,7 @@ catch (McpException ex) when (ex.ErrorCode == McpErrorCode.InvalidParams)
 
 ## Complete Example
 
-See the [LongRunningTasks sample](https://github.com/modelcontextprotocol/csharp-sdk/tree/main/samples/LongRunningTasks) for a complete working example demonstrating:
+See the [LongRunningTasks sample](../../../samples/LongRunningTasks) for a complete working example demonstrating:
 
 - Server setup with a file-based `IMcpTaskStore` for durability
 - Explicit task creation via `IMcpTaskStore` in tools returning `McpTask`
@@ -558,7 +558,7 @@ public class JobProcessor(IMcpTaskStore taskStore)
 
 ### Simplified Example: File-Based Task Store
 
-The [LongRunningTasks sample](https://github.com/modelcontextprotocol/csharp-sdk/tree/main/samples/LongRunningTasks) demonstrates a simplified fault-tolerant approach using the file system. The `FileBasedMcpTaskStore` persists task state to disk, allowing tasks to survive server restarts:
+The [LongRunningTasks sample](../../../samples/LongRunningTasks) demonstrates a simplified fault-tolerant approach using the file system. The `FileBasedMcpTaskStore` persists task state to disk, allowing tasks to survive server restarts:
 
 ```csharp
 // Use a file-based task store for durability

docs/list-of-diagnostics.md

@@ -23,4 +23,4 @@ If you use experimental APIs, you will get one of the diagnostics shown below. T
 
 | Diagnostic ID | Description |
 | :------------ | :---------- |
-| `MCPEXP001` | MCP task-related APIs are experimental. Tasks provide a mechanism for asynchronous long-running operations that can be polled for status and results. See [MCP Tasks specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/docs/specification/2025-06-18/server/utilities/tasks.md) for details. |
+| `MCPEXP001` | MCP task-related APIs are experimental. Tasks provide a mechanism for asynchronous long-running operations that can be polled for status and results. See [MCP Tasks specification](https://modelcontextprotocol.io/specification/draft/basic/utilities/tasks) for details. |