HIP-3 dex parameter missing from docstrings for user_state, open_orders, all_mids #286

Feedback from an HIP-3 MM bot operator. Discovered these gaps while building a multi-DEX trading bot.

Problem

Several Info methods support a dex parameter for HIP-3 (builder-deployed perpetuals), but the docstrings don't document it in the Args section. This makes it hard for developers to discover HIP-3 support.

Affected methods

Impact

HIP-3 bot developers don't realize these methods support DEX filtering. Common mistake: calling info.open_orders(addr) and wondering why HIP-3 orders aren't returned. The dex parameter is only discoverable by reading the source code.

Suggestion

Add dex to the Args section of each docstring, e.g.:

def user_state(self, address: str, dex: str = "") -> Any:
    """Retrieve trading details about a user.

    Args:
        address (str): Onchain address in 42-character hexadecimal format.
        dex (str): HIP-3 DEX name (e.g. "xyz", "flx", "km").
                   Empty string "" for standard Hyperliquid perps.
    """