update attachment & docs (#1815)

src/structures/Attachment.js

@@ -1,10 +1,13 @@
 /**
  * Represents an attachment in a message.
+ * @param {BufferResolvable|Stream} file The file
+ * @param {string} [name] The name of the file, if any
  */
 class Attachment {
   constructor(file, name) {
     this.file = null;
-    this._attach(file, name);
+    if (name) this.setAttachment(file, name);
+    else this._attach(file);
   }
 
   /**
@@ -42,7 +45,7 @@ class Attachment {
     * @returns {Attachment} This attachment
     */
   setFile(attachment) {
-    this.file.attachment = attachment;
+    this.file = { attachment };
     return this;
   }
 
@@ -63,10 +66,8 @@ class Attachment {
     * @private
     */
   _attach(file, name) {
-    if (file) {
-      if (typeof file === 'string') this.file = file;
-      else this.setAttachment(file, name);
-    }
+    if (typeof file === 'string') this.file = file;
+    else this.setAttachment(file, name);
   }
 }
 

src/structures/Webhook.js

@@ -94,7 +94,7 @@ class Webhook {
   /**
    * Send a message with this webhook.
    * @param {StringResolvable} [content] The content to send
-   * @param {WebhookMessageOptions} [options={}] The options to provide
+   * @param {WebhookMessageOptions|MessageEmbed|Attachment|Attachment[]} [options={}] The options to provide
    * @returns {Promise<Message|Object>}
    * @example
    * // Send a message

src/structures/interfaces/TextBasedChannel.js

@@ -66,7 +66,7 @@ class TextBasedChannel {
   /**
    * Send a message to this channel.
    * @param {StringResolvable} [content] Text for the message
-   * @param {MessageOptions} [options={}] Options for the message
+   * @param {MessageOptions|MessageEmbed|Attachment|Attachment[]} [options={}] Options for the message
    * @returns {Promise<Message|Message[]>}
    * @example
    * // Send a message