docs: minor changes

Author: snowyu

README.cn.md

@@ -102,7 +102,8 @@ output: /The Answer is {{answer}}.$/i
 
 ### `Diff` 验证字符串
 
-使用`diff`可以对字符串进行补充验证
+使用`diff`可以对字符串进行补充验证。比如可以允许字符串中把助词"的"改为"地",允许存在额外的空行。
+使得当字符串结果存在这些少量的不同的时候，也能通过验证。
 
 ```yaml
 ---
@@ -113,8 +114,14 @@ description: 'This is a AI test fixtures file'
     ...
   output: “这是应该输出的内容”
   diff:
-    - add: true # 允许额外添加的空行
+    # 允许额外添加的空行
+    - add: true
       value: '\n'
+    # 允许将"的"改为"地"
+    - value: "的"
+      removed: true
+    - value: "地"
+      added: true
 ```
 
 ### 用 JSON Schema 验证

README.md

@@ -132,7 +132,7 @@ Default template data:
 
 ## `Diff` String Validation
 
-Using `diff` can validate and supplement string
+Using `diff` can help validate and supplement strings. For example, it allows the existence of extra blank lines. This ensures that when there are minor differences in the string results, they can still pass the validation.
 
 ```yaml
 ---