JavaScript has 7 primitive types

[wisammechano]

In most textbooks and at MDN it is mentioned that JavaScript has 7 primitive types. However, in this lesson, we say there are 3.

curriculum-backend-readings/module8-typescript/r1.1-everyday-types/README.md

Line 29 in 19fe42e

JavaScript has three primitive types -- `string`, `number`, `boolean` -- and they are present in TypeScript as well. You can declare them just as you would in JavaScript. However, in TypeScript, you may _optionally_ add a type. As mentioned previously, in most cases TypeScript can infer the type correctly.

I understand the authors meaning for the example but we may need to adjust the wording.

[Shrreya]

Would it be better to say "three frequently used primitive types"?
And we can also link the MDN resource as a reference for learning about all primitive types.