feat: correct the prompt grammar. (#11328)

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/core/prompt/prompt_templates/advanced_prompt_templates.py

 CHAT_APP_COMPLETION_PROMPT_CONFIG = {
     "completion_prompt_config": {
         "prompt": {
-            "text": "{{#pre_prompt#}}\nHere is the chat histories between human and assistant, inside <histories></histories> XML tags.\n\n<histories>\n{{#histories#}}\n</histories>\n\n\nHuman: {{#query#}}\n\nAssistant: "  # noqa: E501
+            "text": "{{#pre_prompt#}}\nHere are the chat histories between human and assistant, inside <histories></histories> XML tags.\n\n<histories>\n{{#histories#}}\n</histories>\n\n\nHuman: {{#query#}}\n\nAssistant: "  # noqa: E501
         },
         "conversation_histories_role": {"user_prefix": "Human", "assistant_prefix": "Assistant"},
     },

api/core/workflow/nodes/llm/node.py

                     "completion_model": {
                         "conversation_histories_role": {"user_prefix": "Human", "assistant_prefix": "Assistant"},
                         "prompt": {
-                            "text": "Here is the chat histories between human and assistant, inside "
+                            "text": "Here are the chat histories between human and assistant, inside "
                             "<histories></histories> XML tags.\n\n<histories>\n{{"
                             "#histories#}}\n</histories>\n\n\nHuman: {{#sys.query#}}\n\nAssistant:",
                             "edition_type": "basic",

api/core/workflow/nodes/parameter_extractor/prompts.py

 Step 4: Ensure that the JSON object is properly formatted and valid. The output should not contain any XML tags. Only the JSON object should be outputted.
 
 ### Memory
-Here is the chat histories between human and assistant, inside <histories></histories> XML tags.
+Here are the chat histories between human and assistant, inside <histories></histories> XML tags.
 <histories>
 {histories}
 </histories>
 The structure of the JSON object you can found in the instructions.
 
 ### Memory
-Here is the chat histories between human and assistant, inside <histories></histories> XML tags.
+Here are the chat histories between human and assistant, inside <histories></histories> XML tags.
 <histories>
 {histories}
 </histories>

api/core/workflow/nodes/question_classifier/template_prompts.py

     ### Constraint
     DO NOT include anything other than the JSON array in your response.
     ### Memory
-    Here is the chat histories between human and assistant, inside <histories></histories> XML tags.
+    Here are the chat histories between human and assistant, inside <histories></histories> XML tags.
     <histories>
     {histories}
     </histories>
 Assistant:{{"keywords": ["bad service", "slow", "food", "tip", "terrible", "waitresses"],"category_id": "f6ff5bc3-aca0-4e4a-8627-e760d0aca78f","category_name": "Experience"}}
 </example> 
 ### Memory
-Here is the chat histories between human and assistant, inside <histories></histories> XML tags.
+Here are the chat histories between human and assistant, inside <histories></histories> XML tags.
 <histories>
 {histories}
 </histories>