Fix doc comment rendering.

src/Discord.Net.Commands/Attributes/PreconditionAttribute.cs

@@ -9,7 +9,7 @@ namespace Discord.Commands
         /// <summary>
         /// Specify a group that this precondition belongs to. Preconditions of the same group require only one
         /// of the preconditions to pass in order to be successful (A || B). Specifying <see cref="Group"/> = 0
-        /// or not at all will require *all* preconditions to pass, just like normal (A && B).
+        /// or not at all will require *all* preconditions to pass, just like normal (A &amp;&amp; B).
         /// </summary>
         public int Group { get; set; } = 0;