Fix typo in the javascript content (#3103)

"There are eight basic data types in JavaScript" is ambiguous (are objects considered "basic" ?).
Javascript features seven (7) primitive datatypes and all objects are non-primitives.
Source (MDN) : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures

content/roadmaps/106-javascript/content/102-javascript-datatypes/readme.md

@@ -1,6 +1,6 @@
 # Datatypes
 
-Data type refers to the type of data that a JavaScript variable can hold. There are eight basic data types in JavaScript.
+Data type refers to the type of data that a JavaScript variable can hold. There are seven primitive data types in JavaScript (Number, BigInt, String, Boolean, Null, Undefined and Symbol). Objects are non-primitives.
 
 <ResourceGroupTitle>Free Content</ResourceGroupTitle>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.codeguage.com/courses/js/data-types'>JavaScript Data Types - CodeGuage</BadgeLink>