Fix documentations that were incorrect or missing (#1837)

* Fix docs for Guild#pruneMembers

* ClientApplication returns

* Guild#deleteEmoji

* Guild#setRolePosition takes RoleResolvable

* Client#fetchApplication returns ClientApplication not Oauth2Application

* ClientDataResolver#resolveImage can return null

* ClientApplication#toString small example

* Guild#allowDMs now has a only for user accounts warning

* ClientUserSettings#patch is private and setGuildPosition has a user account warning

* Role#setPermissions can take PermissionResolvable, not just String

* ChannelCreationOverwrites is for a role or a member, not for a "group"

* Fix ChannelData#userlimit string being wrong
"The user limit of voice the channel" :lul:

* ChannelResolvable is only for Channel or Snowflake

* EmojiIdentifierResolvable supports Snowflakes

* UserResolvable doesn't take a guild

* Make patch functions private

* Remove examples

* Webhoox#edit options.name defaults to the webhook name

* Make VoiceConnection functions private

* Am dum
The whole ClientUserSettings category is only for self bots soo

* Value for update functions is *

* Make update functions be private

* Fix GuildEditData missing Ssytemchannel property

* PermissionOverwriteOptions can accept null as an option
(Why did no-one document this?)

src/structures/ClientUserSettings.js

@@ -14,6 +14,7 @@ class ClientUserSettings {
   /**
    * Patch the data contained in this class with new partial data.
    * @param {Object} data Data to patch this with
+   * @private
    */
   patch(data) {
     for (const [key, value] of Object.entries(Constants.UserSettingsMap)) {
@@ -29,14 +30,16 @@ class ClientUserSettings {
   /**
    * Update a specific property of of user settings.
    * @param {string} name Name of property
-   * @param {value} value Value to patch
+   * @param {*} value Value to patch
    * @returns {Promise<Object>}
+   * @private
    */
   update(name, value) {
     return this.user.client.api.users['@me'].settings.patch({ data: { [name]: value } });
   }
 
   /**
+   * Sets the position of the guild in the guild listing.
    * @param {Guild} guild The guild to move
    * @param {number} position Absolute or relative position
    * @param {boolean} [relative=false] Whether to position relatively or absolutely