更新文档，添加和修改多个API接口的描述，确保文档内容的准确性和完整性，提升开发者使用体验。

docs/grvt/schemas/api_orderbook_levels_response.md

@@ -0,0 +1,23 @@
+!!! info "[ApiOrderbookLevelsResponse](/../../schemas/api_orderbook_levels_response)"
+    |Name<br>`Lite`|Type|Required<br>`Default`| Description |
+    |-|-|-|-|
+    |result<br>`r` |OrderbookLevels|True|The orderbook levels objects matching the request asset|
+    ??? info "[OrderbookLevels](/../../schemas/orderbook_levels)"
+        |Name<br>`Lite`|Type|Required<br>`Default`| Description |
+        |-|-|-|-|
+        |event_time<br>`et` |string|True|Time at which the event was emitted in unix nanoseconds|
+        |instrument<br>`i` |string|True|The readable instrument name:<ul><li>Perpetual: `ETH_USDT_Perp`</li><li>Future: `BTC_USDT_Fut_20Oct23`</li><li>Call: `ETH_USDT_Call_20Oct23_2800`</li><li>Put: `ETH_USDT_Put_20Oct23_2800`</li></ul>|
+        |bids<br>`b` |[OrderbookLevel]|True|The list of best bids up till query depth|
+        |asks<br>`a` |[OrderbookLevel]|True|The list of best asks up till query depth|
+        ??? info "[OrderbookLevel](/../../schemas/orderbook_level)"
+            |Name<br>`Lite`|Type|Required<br>`Default`| Description |
+            |-|-|-|-|
+            |price<br>`p` |string|True|The price of the level, expressed in `9` decimals|
+            |size<br>`s` |string|True|The number of assets offered, expressed in base asset decimal units|
+            |num_orders<br>`no` |integer|True|The number of open orders at this level|
+        ??? info "[OrderbookLevel](/../../schemas/orderbook_level)"
+            |Name<br>`Lite`|Type|Required<br>`Default`| Description |
+            |-|-|-|-|
+            |price<br>`p` |string|True|The price of the level, expressed in `9` decimals|
+            |size<br>`s` |string|True|The number of assets offered, expressed in base asset decimal units|
+            |num_orders<br>`no` |integer|True|The number of open orders at this level|