Documentation improvements (#2069)

* docs: fix documentation in various places

All stores: resolveID returns a nullable Snowflake
GuildAuditLogs: ActionType also can be ALL
MessageEmbed: make files property show up in the docs
ClientApplication: resetSecret and resetToken return a promise
ClientManager: status is readonly
Guild: features is an array of strings and ban no longer accepts a number or string
Guild: ban method no longer accepts a string or number
GuildMember: ^
RichPresenceAssets: small and large Image are Snowflakes, also fixed parameter documentation for small and large image url method
WebhookMessageOptions: file property is no longer a thing

* docs: improve GuildAuditLogs documentation

Prefix types with AuditLog to avoid confusion
Document GuildAuditLogs' static Targets and Actions properties and add necessary typedefs
Use typdefs over primitives where possible.

* fix documentation for Guild#defaultRole

src/structures/Guild.js

@@ -115,7 +115,7 @@ class Guild extends Base {
 
     /**
      * An array of guild features
-     * @type {Object[]}
+     * @type {string[]}
      */
     this.features = data.features;
 
@@ -401,7 +401,7 @@ class Guild extends Base {
     }
   }
 
-  /*
+  /**
    * The `@everyone` role of the guild
    * @type {Role}
    * @readonly
@@ -802,7 +802,7 @@ class Guild extends Base {
   /**
    * Bans a user from the guild.
    * @param {UserResolvable} user The user to ban
-   * @param {Object|number|string} [options] Ban options. If a number, the number of days to delete messages for, if a
+   * @param {Object} [options] Ban options. If a number, the number of days to delete messages for, if a
    * string, the ban reason. Supplying an object allows you to do both.
    * @param {number} [options.days=0] Number of days of messages to delete
    * @param {string} [options.reason] Reason for banning