put required attributes first in table

Author: betegon

develop-docs/sdk/expected-features/mcp-instrumentation/tracing.mdx

@@ -17,10 +17,10 @@ All MCP Server spans share common attributes and follow consistent patterns:
 | Data Attribute              | Type   | Requirement Level | Description                                                                   | Example                                |
 | :-------------------------- | :----- | :---------------- | :---------------------------------------------------------------------------- | :------------------------------------- |
 | `mcp.method.name`           | string | required          | The name of the request or notification method.                               | `"tools/call"`                         |
-| `mcp.request.id`            | string | optional          | A unique identifier for the request.                                          | `"42"`                                 |
-| `mcp.session.id`            | string | optional          | Identifies the MCP session. Can be undefined as MCP servers can be stateless. | `"191c4850af6c49..."`   |
 | `mcp.transport`             | string | required          | The transport method used for MCP communication. **[2]**                      | `"stdio"`                              |
 | `network.transport`         | string | required          | OSI transport layer protocol. **[3]**                                         | `"pipe"`                               |
+| `mcp.request.id`            | string | optional          | A unique identifier for the request.                                          | `"42"`                                 |
+| `mcp.session.id`            | string | optional          | Identifies the MCP session. Can be undefined as MCP servers can be stateless. | `"191c4850af6c49..."`   |
 | `network.protocol.version`  | string | optional          | The version of JSON RPC protocol used.                                        | `"2.0"`                                |
 
 **[2]** Well-defined values for data attribute `mcp.transport`: