docs: Fix some small typos or "missing" docs (#1943)

* Fix documentation for GuildAuditLogEntry.target

* Update documentation for CategoryChannel#children

* Add EntryTarget for audit logs

I've done this to "fulfill" devsneks request while also showing all the possible results for the target of an AuditLogEntry

* Oops Eslint

* Private timeout sets gets set by BaseClient not WebhookClient

* Fix the "Missing Docs" for Presence#activity

* Small doc inconsistency

Array<Number> instead of Array<number> for Activity

* Client#emojis is an EmojiStore not a Collection

* Document ClientPresenceStore

Just so its clickable through the wiki, nothing else is documented

* Small fix for BaseClient#setInterval

You don't wait before executing, you execute every X ms

* GuildChannelResolvable takes a GuildChannel/Snowflake

* Typo in UserResolvable

* Another typo for UserResolvable

* Add the number to the Status and VoiceStatus docs

Its probably not needed, but just so the user knows what each number means, its now documented.

src/client/BaseClient.js

@@ -25,14 +25,14 @@ class BaseClient extends EventEmitter {
     this.rest = new RESTManager(this, options._tokenType);
 
     /**
-     * Timeouts set by {@link WebhookClient#setTimeout} that are still active
+     * Timeouts set by {@link BaseClient#setTimeout} that are still active
      * @type {Set<Timeout>}
      * @private
      */
     this._timeouts = new Set();
 
     /**
-     * Intervals set by {@link WebhookClient#setInterval} that are still active
+     * Intervals set by {@link BaseClient#setInterval} that are still active
      * @type {Set<Timeout>}
      * @private
      */
@@ -95,7 +95,7 @@ class BaseClient extends EventEmitter {
   /**
    * Sets an interval that will be automatically cancelled if the client is destroyed.
    * @param {Function} fn Function to execute
-   * @param {number} delay Time to wait before executing (in milliseconds)
+   * @param {number} delay Time to wait between executions (in milliseconds)
    * @param {...*} args Arguments for the function
    * @returns {Timeout}
    */