Apply suggestions from code review

Co-authored-by: Burhan Ali <1482649+biggianteye@users.noreply.github.com>

Author: j0lol

js/lesson1/tutorial.md

@@ -164,7 +164,7 @@ A line starting with `let` is a **variable definition**. You should
 use this whenever you are creating a new variable.
 
 > In previous versions of JavaScript, `var` was used for all
-**variable defintions**, but `let` is now considered better to use.
+**variable definitions**, but `let` is now considered better to use.
 [You can read more about why on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/var#description).
 
 You can also change the value of a variable. That's why it's a

js/lesson9/tutorial.md

@@ -99,7 +99,7 @@ This means that we have loaded our very first object into our REPL! Without exit
 const cat = new Cat ();
 ```
 
-(It doesn't really matter what you call the variable. Variable names are arbitrary in all programming languages, so we could say ```const ginger = new Cat ();``` or ```var luciferTheEvilCat = new Cat ();```. However, it is good practice to pick variable names that are clear and intuitive.)
+(It doesn't really matter what you call the variable. Variable names are arbitrary in all programming languages, so we could say 
 
 This creates a new Cat object. Think about the Cat function as a blueprint for how every new Cat object ought to be made. However, a blueprint of a cat is not a cat! Using JavaScript, we created an "instance" of a cat based on the blueprint.