fix(bot): trim misleading comment in IsComplete

The previous comment claimed a 0 MaxPlayers would also be blocked, but
the code never actually enforced that. The wizard's text-input path
already guarantees cap >= MinCapacity, so 0 is unreachable. Drop the
inaccurate half-sentence to keep the comment faithful to the code.

src/GmRelay.Bot/Features/Sessions/CreateSession/CreateSessionHandler.cs

@@ -230,10 +230,7 @@ public sealed class CreateSessionHandler
         {
             if (p.Single?.ScheduledAt is null) missingFields.Add("дата/время");
             // MaxPlayers = null is a valid "♾ Без лимита" choice
-            // (see GameCreationWizard.ApplyCapacityChoice "no_limit"). Only a
-            // missing wizard step on the numeric-input path is a real defect;
-            // a non-null 0 also blocks (zero players is never what the user
-            // asked for). Treat null as "no limit" and accept it.
+            // (see GameCreationWizard.ApplyCapacityChoice "no_limit").
         }
         else
         {