Adds documentations for adapters and main constructors (#4951)

* wip

* Adds documentations for adapters, and constructors

* nits

* nit

src/Adapters/Cache/CacheAdapter.js

@@ -1,23 +1,29 @@
 /*eslint no-unused-vars: "off"*/
+/**
+ * @module Adapters
+ */
+/**
+ * @interface CacheAdapter
+ */
 export class CacheAdapter {
   /**
    * Get a value in the cache
-   * @param key Cache key to get
-   * @return Promise that will eventually resolve to the value in the cache.
+   * @param {String} key Cache key to get
+   * @return {Promise} that will eventually resolve to the value in the cache.
    */
   get(key) {}
 
   /**
    * Set a value in the cache
-   * @param key Cache key to set
-   * @param value Value to set the key
-   * @param ttl Optional TTL
+   * @param {String} key Cache key to set
+   * @param {String} value Value to set the key
+   * @param {String} ttl Optional TTL
    */
   put(key, value, ttl) {}
 
   /**
    * Remove a value from the cache.
-   * @param key Cache key to remove
+   * @param {String} key Cache key to remove
    */
   del(key) {}