Add contentn to js roadmap (#6718)

* Update call@gsyY3Oa3Jf0W5K_lyqBYO.md

Add short description and code example of the call() method. Add article.

* Update src/data/roadmaps/javascript/content/call@gsyY3Oa3Jf0W5K_lyqBYO.md

---------

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/javascript/content/call@gsyY3Oa3Jf0W5K_lyqBYO.md

@@ -1 +1,7 @@
-# call
+# call()
+
+The `call()` method allows you to invoke a function with a given `this` value, and arguments provided individually. 
+
+Visit the following resources to learn more:
+
+- [@article@Understanding Explicit Binding in JavaScript: Call, Bind, and Apply Methods](https://medium.com/@amitsharma_24072/understanding-explicit-binding-in-javascript-call-bind-and-apply-methods-7b6ed0107628)