Add xmldocs.

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

Commands/ErrorLoggingPostExecutionEvent.cs

@@ -7,6 +7,9 @@ using Remora.Results;
 
 namespace Boyfriend.Commands;
 
+/// <summary>
+///     Handles error logging for slash command groups.
+/// </summary>
 public class ErrorLoggingPostExecutionEvent : IPostExecutionEvent {
     private readonly ILogger<ErrorLoggingPostExecutionEvent> _logger;
 
@@ -14,6 +17,14 @@ public class ErrorLoggingPostExecutionEvent : IPostExecutionEvent {
         _logger = logger;
     }
 
+    /// <summary>
+    ///     Logs a warning using the injected <see cref="ILogger" /> if the <paramref name="commandResult" /> has not
+    ///     succeeded.
+    /// </summary>
+    /// <param name="context">The context of the slash command. Unused.</param>
+    /// <param name="commandResult">The result whose success is checked.</param>
+    /// <param name="ct">The cancellation token for this operation. Unused.</param>
+    /// <returns>A result which has succeeded.</returns>
     public Task<Result> AfterExecutionAsync(
         ICommandContext context, IResult commandResult, CancellationToken ct = default) {
         if (!commandResult.IsSuccess)