docs: document HIP-3 dex parameter on Info query methods

Add the missing `dex` parameter to the Args docstrings of user_state,
open_orders, frontend_open_orders, all_mids, and meta -- the five Info
methods that already accept and forward a `dex` argument for HIP-3
builder-deployed perpetuals. Improves discoverability of HIP-3 support.

Fixes #286.

Author: claygeo

hyperliquid/info.py

@@ -91,6 +91,8 @@ def user_state(self, address: str, dex: str = "") -> Any:
         Args:
             address (str): Onchain address in 42-character hexadecimal format;
                             e.g. 0x0000000000000000000000000000000000000000.
+            dex (str): Dex name for HIP-3 builder-deployed perpetuals.
+                       Defaults to "" (the original dex).
         Returns:
             {
                 assetPositions: [
@@ -138,6 +140,8 @@ def open_orders(self, address: str, dex: str = "") -> Any:
         Args:
             address (str): Onchain address in 42-character hexadecimal format;
                             e.g. 0x0000000000000000000000000000000000000000.
+            dex (str): Dex name for HIP-3 builder-deployed perpetuals.
+                       Defaults to "" (the original dex).
         Returns: [
             {
                 coin: str,
@@ -159,6 +163,8 @@ def frontend_open_orders(self, address: str, dex: str = "") -> Any:
         Args:
             address (str): Onchain address in 42-character hexadecimal format;
                             e.g. 0x0000000000000000000000000000000000000000.
+            dex (str): Dex name for HIP-3 builder-deployed perpetuals.
+                       Defaults to "" (the original dex).
         Returns: [
             {
                 children:
@@ -189,6 +195,10 @@ def all_mids(self, dex: str = "") -> Any:
 
         POST /info
 
+        Args:
+            dex (str): Dex name for HIP-3 builder-deployed perpetuals.
+                       Defaults to "" (the original dex).
+
         Returns:
             {
               ATOM: float string,
@@ -275,6 +285,10 @@ def meta(self, dex: str = "") -> Meta:
 
         POST /info
 
+        Args:
+            dex (str): Dex name for HIP-3 builder-deployed perpetuals.
+                       Defaults to "" (the original dex).
+
         Returns:
             {
                 universe: [