Fixed Grammar issues

Author: TomPadmanathan

README.md

@@ -1,6 +1,6 @@
 # The Modern JavaScript Tutorial
 
-This repository hosts the English content of the Modern JavaScript Tutorial, published in [https://javascript.info](https://javascript.info).
+This repository hosts the English content of the Modern JavaScript Tutorial, published at [https://javascript.info](https://javascript.info).
 
 ## Translations
 
@@ -12,17 +12,17 @@ See <https://javascript.info/translate> for the details.
 
 We'd also like to collaborate on the tutorial with other people.
 
-Something's wrong? A topic is missing? Explain it to people, add as PR 👏
+Something's wrong? A topic is missing? Explain it to people, add it as PR 👏
 
-**You can edit the text in any editor.** The tutorial uses enhanced "markdown" format, easy to grasp. And if you want to see how it looks on-site, there's a server to run the tutorial locally at <https://github.com/javascript-tutorial/server>.
+**You can edit the text in any editor.** The tutorial uses an enhanced "markdown" format, easy to grasp. And if you want to see how it looks on-site, there's a server to run the tutorial locally at <https://github.com/javascript-tutorial/server>.
 
 The list of contributors is available at <https://javascript.info/about#contributors>.
 
 ## Structure
 
-Every chapter, article or a task has its folder.
+Every chapter, article, or task has its folder.
 
-The folder is named like `N-url`, where `N` is a number for the sorting purposes and `url` is the URL part with title of the material.
+The folder is named like `N-url`, where `N` is a number for the sorting purposes and `URL` is the URL part with the title of the material.
 
 The type of the material is defined by the file inside the folder: