docs(CommandDelegate): add XML doc comments to CommandBeforeDelegate and CommandAfterDelegate

CommandHook/CommandDelegate.cs

@@ -2,5 +2,16 @@ using Vintagestory.API.Common;
 
 namespace CommandHook;
 
+/// <summary>
+/// Invoked before a watched command runs. Set <c>data.Cancel = true</c> to stop
+/// the command from executing.
+/// </summary>
+/// <param name="data">The command data, passed by ref so you can read or cancel it.</param>
 public delegate void CommandBeforeDelegate(ref CommandData data);
+
+/// <summary>
+/// Invoked after a watched command has run. Not invoked if a Before listener cancelled it.
+/// </summary>
+/// <param name="data">The command data, passed by ref for consistency with <see cref="CommandBeforeDelegate"/>.</param>
+/// <param name="result">The result the command produced.</param>
 public delegate void CommandAfterDelegate(ref CommandData data, TextCommandResult result);