docs: scope the changeset to the model picker path

Author: elkaix

.changeset/remember-last-used-model.md

@@ -2,4 +2,4 @@
 "@pymodel/pythinker-code": minor
 ---
 
-Your last chosen model is now remembered and restored when your configured default becomes unavailable, and equally capable models now prefer newer versions.
+The model you pick in the model picker is now remembered and restored when your default model becomes unavailable, and equally capable models now prefer the newer version.