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/withdrawal.md

@@ -0,0 +1,17 @@
+!!! info "[Withdrawal](/../../schemas/withdrawal)"
+    |Name<br>`Lite`|Type|Required<br>`Default`| Description |
+    |-|-|-|-|
+    |from_account_id<br>`fa` |string|True|The subaccount to withdraw from|
+    |to_eth_address<br>`te` |string|True|The ethereum address to withdraw to|
+    |currency<br>`c` |string|True|The token currency to withdraw|
+    |num_tokens<br>`nt` |string|True|The number of tokens to withdraw|
+    |signature<br>`s` |Signature|True|The signature of the withdrawal|
+    ??? info "[Signature](/../../schemas/signature)"
+        |Name<br>`Lite`|Type|Required<br>`Default`| Description |
+        |-|-|-|-|
+        |signer<br>`s` |string|True|The address (public key) of the wallet signing the payload|
+        |r<br>`r` |string|True|Signature R|
+        |s<br>`s1` |string|True|Signature S|
+        |v<br>`v` |integer|True|Signature V|
+        |expiration<br>`e` |string|True|Timestamp after which this signature expires, expressed in unix nanoseconds. Must be capped at 30 days|
+        |nonce<br>`n` |integer|True|Users can randomly generate this value, used as a signature deconflicting key.<br>ie. You can send the same exact instruction twice with different nonces.<br>When the same nonce is used, the same payload will generate the same signature.<br>Our system will consider the payload a duplicate, and ignore it.|