Fixed typos, punctuation (#20666)

Also changed class "created" to  "instantiated". Classes don't get created, objects get created.

guide/english/csharp/class/index.md

@@ -3,7 +3,7 @@ title: Class
 ---
 ## Class
 	
-A class in C# is defined as a reference type. In order to instatiate a variable of with a reference type you must specify the `new` keyword, else the variable will have the default value of `null`. See below for an example.
+A class in C# is defined as a reference type. In order to instatiate a variable of a reference type you must use the `new` keyword, else the variable will have the default value of `null`. See below for an example.
 
 ```csharp
 // The value of variableOne is null at this point.
@@ -12,12 +12,12 @@ NewClass variableOne;
 // Now the value of variableOne will be an instance of the class NewClass
 variableOne = new NewClass();
 ```
-At runtime when the class is created enough memory is allocated onto the heap for that specific instance of the class that the variable holds. 
+At runtime, when the class is instantiated, enough memory is allocated onto the heap for that specific instance of the class that the variable holds. 
 
 #### Creating Classes
 To create a class in C# we need to use the `class` keyword followed by a unique identifier.
 
-Like other languages, C# creates a default constructor that accepts no parameters. We can also specify our own constructor if we need to take in special parameters or have custom initlization steps in our constructor.
+Like other languages, C# creates a default constructor that accepts no parameters. We can also specify our own constructor if we need to take in special parameters or have custom initialization steps in our constructor.
 
 ```csharp
 public class NewClass
@@ -29,7 +29,7 @@ public class NewClass
 }
 ```
 
-A class is a prototype or blueprint from which objects are created. In C#, the class is defined by using the keyword class. A class is used to combine together some methods, properties, fields, events, and delegates into a single unit. A class may contain nested classes too.
+A class is a prototype or blueprint from which objects are created. In C#, the class is defined by using the keyword `class`. A class is used to combine together some methods, properties, fields, events, and delegates into a single unit. A class may contain nested classes too.
 #### Example: Consider the case of Employee Class below:
 
 ```csharp