[update][abaoxomtieu]: update grammar prompt

apis/V1/prompts/prompt.py

@@ -115,6 +115,7 @@ def grammar_check_prompt(sentence):
     1. Read the text carefully.
     2. Correct the grammar mistakes in the text.
     3. Return the corrected text.
+    4. If there are no mistakes, return the original text.
     Examples:
 
     Example 1:
@@ -134,8 +135,8 @@ def grammar_check_prompt(sentence):
 
     You must return in JSON format, field is mandatory:
     {{
-        "incorrect": [list of incorrect words or phrases, it can be repeated], 
-        "correct": [list of correct words or phrases, it can be repeated], 
+        "incorrect": [list of incorrect words or phrases, it can be repeated, if there are no mistakes, return an empty list], 
+        "correct": [list of correct words or phrases, it can be repeated in the same order as the incorrect list, if there are no mistakes, return an empty list], 
         "corrected_sentence": corrected sentence
     }}
 """