Alter parameter naming (#6)

Slightly better wording

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

@@ -15,7 +15,7 @@ namespace Discord.Commands
         /// </summary>
         /// <param name="context">The context of the command.</param>
         /// <param name="parameter">The parameter of the command being checked against.</param>
-        /// <param name="value">The raw value of the type.</param>
+        /// <param name="value">The raw value of the parameter.</param>
         /// <param name="services">The service collection used for dependency injection.</param>
         public abstract Task<PreconditionResult> CheckPermissionsAsync(ICommandContext context, ParameterInfo parameter, object value, IServiceProvider services);
     }