refactor: update variant description in Entries and Entry classes for clarity; enhance constructor overloads in Query class

Author: reeshika-h

src/entries/entries.ts

@@ -263,7 +263,7 @@ export class Entries extends BaseQuery {
   /**
    * @method variants
    * @memberof Entries
-   * @description The variant header will be added to axios client. Branch is optional.
+   * @description Stores the variant UID(s) and optional branch name, which are sent as the `x-cs-variant-uid` and `branch` headers on the request when find() is called.
    * @param {string | string[]} variants - Variant UID or UIDs
    * @param {string} [branchName] - Optional branch name sent as the `branch` header
    * @returns {Entries}

src/entries/entry.ts

@@ -42,7 +42,7 @@ export class Entry {
   /**
    * @method variants
    * @memberof Entry
-   * @description The variant header will be added to axios client. Branch is optional.
+   * @description Stores the variant UID(s) and optional branch name, which are sent as the `x-cs-variant-uid` and `branch` headers on the request when fetch() is called.
    * @param {string | string[]} variants - Variant UID or UIDs
    * @param {string} [branchName] - Optional branch name sent as the `branch` header
    * @returns {Entry}

src/query/query.ts

@@ -7,6 +7,23 @@ import { ErrorMessages } from '../common/error-messages';
 export class Query extends BaseQuery {
   private _contentTypeUid?: string;
 
+  constructor(
+    client: AxiosInstance,
+    params: params,
+    queryParams: queryParams,
+    variants?: string,
+    uid?: string,
+    queryObj?: { [key: string]: any }
+  );
+  constructor(
+    client: AxiosInstance,
+    params: params,
+    queryParams: queryParams,
+    variants?: string,
+    uid?: string,
+    variantsBranch?: string,
+    queryObj?: { [key: string]: any }
+  );
   constructor(
     client: AxiosInstance,
     params: params,