Fix Claude Sonnet 4 model ID (#31505)

This PR is a follow-up to
https://github.com/zed-industries/zed/pull/31415 that fixes the model ID
for Claude Sonnet 4.

With the release of the Claude 4 models, the model version now appears
at the end.

Release Notes:

- N/A

docs/src/ai/temperature.md

@@ -16,7 +16,7 @@ Zed's settings allow you to specify a custom temperature for a provider and/or m
       // To set parameters for a specific provider and model:
       {
         "provider": "zed.dev",
-        "model": "claude-4-sonnet",
+        "model": "claude-sonnet-4",
         "temperature": 1.0
       }
     ],