[Deprecation] Deprecation --convert reward, use --convert embed instead. (#30463)

Signed-off-by: wang.yuqi <yuqi.wang@daocloud.io>

docs/models/pooling_models.md

@@ -316,10 +316,13 @@ We have split the `encode` task into two more specific token-wise tasks: `token_
 
 ### Remove softmax from PoolingParams
 
-We are going to remove `softmax` and `activation` from `PoolingParams`. Instead, use `use_activation`, since we allow `classify` and `token_classify` to use any activation function.
+We are going to remove `softmax` and `activation` from `PoolingParams` in v0.15. Instead, use `use_activation`, since we allow `classify` and `token_classify` to use any activation function.
 
 ### as_reward_model
 
+!!! warning
+    We are going to remove `--convert reward` in v0.15, use `--convert embed` instead.
+
 Pooling models now default support all pooling, you can use it without any settings.
 
 - Extracting hidden states prefers using `token_embed` task.