replace 'evaluation_strategy' with 'eval_strategy'

'evaluation_strategy' is already deprecated.

huggingface/setfit#512

Author: simpx

chapters/zh-CN/chapter7/6.mdx

@@ -423,7 +423,7 @@ args = TrainingArguments(
     output_dir="codeparrot-ds",
     per_device_train_batch_size=32,
     per_device_eval_batch_size=32,
-    evaluation_strategy="steps",
+    eval_strategy="steps",
     eval_steps=5_000,
     logging_steps=5_000,
     gradient_accumulation_steps=8,
@@ -898,4 +898,4 @@ for epoch in range(num_train_epochs):
 
 </Tip>
 
-{/if}
+{/if}