Update part3a.md

A small grammer correction

Author: maxine-jay

src/content/3/en/part3a.md

@@ -154,7 +154,7 @@ import http from 'http'
 
 These days, code that runs in the browser uses ES6 modules. Modules are defined with an [export](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/export) and taken into use with an [import](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import).
 
-However, Node.js uses so-called [CommonJS](https://en.wikipedia.org/wiki/CommonJS) modules. The reason for this is that the Node ecosystem had a need for modules long before JavaScript supported them in the language specification. Node supports now also the use of ES6 modules, but since the support is yet [not quite perfect](https://nodejs.org/api/esm.html#modules-ecmascript-modules) we'll stick to CommonJS modules.
+However, Node.js uses so-called [CommonJS](https://en.wikipedia.org/wiki/CommonJS) modules. The reason for this is that the Node ecosystem had a need for modules long before JavaScript supported them in the language specification. Node supports now also the use of ES6 modules, but since the support is [not quite perfect](https://nodejs.org/api/esm.html#modules-ecmascript-modules) yet, we'll stick to CommonJS modules.
 
 CommonJS modules function almost exactly like ES6 modules, at least as far as our needs in this course are concerned.