Improved phrasing and clarity of the number of polyfill libraries.

[HasanNahiyanNobel]

The Issue

The current article states that:

Two interesting polyfill libraries are:

• core js that supports a lot, allows to include only needed features.

Suggested Fix

Rewrite it in two sentences:

An interesting polyfill library is core-js. It provides extensive support and allows for adding only the needed features.

(Please note that the name of the library includes a hyphen—according to their convention.)

Corresponding Open Issues and Pull Requests

1. Typo in Number of Polyfill Libraries #3784
2. List of polyfills should be converted to a sentence #3762
3. fix: one polyfill library instead of two polyfill libraries #3757
4. Update article.md #3755

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