make isGameProper comment more obvious

Author: smartcontracts

packages/contracts-bedrock/snapshots/semver-lock.json

@@ -153,7 +153,7 @@
   },
   "src/dispute/AnchorStateRegistry.sol": {
     "initCodeHash": "0x00a96ace2161b2ede09cf2082d934fe60769c0120c34d61a22a953e8d6a32860",
-    "sourceCodeHash": "0xe3925207ad74934375a0b411082f09238a5023b359c08af01c4f765225797068"
+    "sourceCodeHash": "0xde0d10f630e7a8911e43ea6a8545f9d1767ae356469d2a2eabbdcb029b8659d9"
   },
   "src/dispute/DelayedWETH.sol": {
     "initCodeHash": "0x759d7f9c52b7c13ce4502f39dae3a75d130c6278240cde0b60ae84616aa2bd48",

packages/contracts-bedrock/src/dispute/AnchorStateRegistry.sol

@@ -131,9 +131,11 @@ contract AnchorStateRegistry is Initializable, ISemver {
         return _game.createdAt().raw() < portal.respectedGameTypeUpdatedAt();
     }
 
-    /// @notice Determines whether a game resolved properly and the game was not subject to any
+    /// @notice **READ THIS FUNCTION DOCUMENTATION CAREFULLY.**
+    ///         Determines whether a game resolved properly and the game was not subject to any
     ///         invalidation conditions. The root claim of a proper game IS NOT guaranteed to be
     ///         valid. The root claim of a proper game CAN BE incorrect and still be a proper game.
+    ///         DO NOT USE THIS FUNCTION ALONE TO DETERMINE IF A ROOT CLAIM IS VALID.
     /// @param _game The game to check.
     /// @return Whether the game is a proper game.
     /// @return Reason why the game is not a proper game.
@@ -152,7 +154,7 @@ contract AnchorStateRegistry is Initializable, ISemver {
             return (false, "game blacklisted");
         }
 
-        // Must be created after the gameRetirementTimestamp.
+        // Must be created at or after the respectedGameTypeUpdatedAt timestamp.
         if (isGameRetired(_game)) {
             return (false, "game retired");
         }