chore: update maas model provider description (#5056)

api/core/model_runtime/model_providers/volcengine_maas/llm/models.py

             'mode': 'chat',
         }
     },
+    'Llama3-8B': {
+         'req_params': {
+            'max_prompt_tokens': 8192,
+            'max_new_tokens': 8192,
+        },
+        'model_properties': {
+            'context_size': 8192,
+            'mode': 'chat',
+        }
+    },
+    'Llama3-70B': {
+         'req_params': {
+            'max_prompt_tokens': 8192,
+            'max_new_tokens': 8192,
+        },
+        'model_properties': {
+            'context_size': 8192,
+            'mode': 'chat',
+        }
+    }
 }

api/core/model_runtime/model_providers/volcengine_maas/volcengine_maas.yaml

 label:
   en_US: Volcengine
 description:
-  en_US: Volcengine MaaS models.
+  en_US: Volcengine Ark models.
+  zh_Hans: 火山方舟提供的模型，例如 Doubao-pro-4k、Doubao-pro-32k 和 Doubao-pro-128k。
 icon_small:
   en_US: icon_s_en.svg
 icon_large:
 help:
   title:
     en_US: Get your Access Key and Secret Access Key from Volcengine Console
+    zh_Hans: 从火山引擎控制台获取您的 Access Key 和 Secret Access Key
   url:
     en_US: https://console.volcengine.com/iam/keymanage/
 supported_model_types:
       required: true
       label:
         en_US: Volcengine Region
-        zh_Hans: 火山引擎地区
+        zh_Hans: 火山引擎地域
       type: text-input
       default: cn-beijing
       placeholder:
           show_on:
             - variable: __model_type
               value: llm
+        - label:
+            en_US: Llama3-8B
+          value: Llama3-8B
+          show_on:
+            - variable: __model_type
+              value: llm
+        - label:
+            en_US: Llama3-70B
+          value: Llama3-70B
+          show_on:
+            - variable: __model_type
+              value: llm
         - label:
             en_US: Doubao-embedding
           value: Doubao-embedding