Fix(49472): Added docs for Set and Map types (#49522)

* wip: started map object

* Feat: Added docs on collection objects

* Accepted baselines.

* Accepted baselines.

* fix: removed unecessary comments

* Adjusted JSDocs as requested

* fix: adjusted more comments

* fix: removed params without description

src/lib/es2015.collection.d.ts

@@ -1,16 +1,36 @@
 interface Map<K, V> {
+
     clear(): void;
+    /**
+     * @returns true if an element in the Map existed and has been removed, or false if the element does not exist.
+     */
     delete(key: K): boolean;
+    /**
+     * Executes a provided function once per each key/value pair in the Map, in insertion order.
+     */
     forEach(callbackfn: (value: V, key: K, map: Map<K, V>) => void, thisArg?: any): void;
+    /**
+     * Returns a specified element from the Map object. If the value that is associated to the provided key is an object, then you will get a reference to that object and any change made to that object will effectively modify it inside the Map.
+     * @returns Returns the element associated with the specified key. If no element is associated with the specified key, undefined is returned.
+     */
     get(key: K): V | undefined;
+    /**
+     * @returns boolean indicating whether an element with the specified key exists or not.
+     */
     has(key: K): boolean;
+    /**
+     * Adds a new element with a specified key and value to the Map. If an element with the same key already exists, the element will be updated.
+     */
     set(key: K, value: V): this;
+    /**
+     * @returns the number of elements in the Map.
+     */
     readonly size: number;
 }
 
 interface MapConstructor {
     new(): Map<any, any>;
-    new<K, V>(entries?: readonly (readonly [K, V])[] | null): Map<K, V>;
+    new <K, V>(entries?: readonly (readonly [K, V])[] | null): Map<K, V>;
     readonly prototype: Map<any, any>;
 }
 declare var Map: MapConstructor;
@@ -23,9 +43,23 @@ interface ReadonlyMap<K, V> {
 }
 
 interface WeakMap<K extends object, V> {
+    /**
+     * Removes the specified element from the WeakMap.
+     * @returns true if the element was successfully removed, or false if it was not present.
+     */
     delete(key: K): boolean;
+    /**
+     * @returns a specified element.
+     */
     get(key: K): V | undefined;
+    /**
+     * @returns a boolean indicating whether an element with the specified key exists or not.
+     */
     has(key: K): boolean;
+    /**
+     * Adds a new element with a specified key and value.
+     * @param key Must be an object.
+     */
     set(key: K, value: V): this;
 }
 
@@ -36,11 +70,28 @@ interface WeakMapConstructor {
 declare var WeakMap: WeakMapConstructor;
 
 interface Set<T> {
+    /**
+     * Appends a new element with a specified value to the end of the Set.
+     */
     add(value: T): this;
+
     clear(): void;
+    /**
+     * Removes a specified value from the Set.
+     * @returns Returns true if an element in the Set existed and has been removed, or false if the element does not exist.
+     */
     delete(value: T): boolean;
+    /**
+     * Executes a provided function once per each value in the Set object, in insertion order.
+     */
     forEach(callbackfn: (value: T, value2: T, set: Set<T>) => void, thisArg?: any): void;
+    /**
+     * @returns a boolean indicating whether an element with the specified value exists in the Set or not.
+     */
     has(value: T): boolean;
+    /**
+     * @returns the number of (unique) elements in Set.
+     */
     readonly size: number;
 }
 
@@ -57,8 +108,18 @@ interface ReadonlySet<T> {
 }
 
 interface WeakSet<T extends object> {
+    /**
+     * Appends a new object to the end of the WeakSet.
+     */
     add(value: T): this;
+    /**
+     * Removes the specified element from the WeakSet.
+     * @returns Returns true if the element existed and has been removed, or false if the element does not exist.
+     */
     delete(value: T): boolean;
+    /**
+     * @returns a boolean indicating whether an object exists in the WeakSet or not.
+     */
     has(value: T): boolean;
 }