Fix typo

Author: timkraut

docs/classes.md

@@ -118,7 +118,7 @@ As always these modifiers work for both member properties and member functions.
 ### Abstract
 `abstract` can be thought of as an access modifier. We present it separately because opposed to the previously mentioned modifiers it can be on a `class` as well as any member of the class. Having an `abstract` modifier primarily means that such functionality *cannot be directly invoked* and a child class must provide the functionality.
 
-* `abstract` **classes** cannot be directly instantiated. Instead the user must create some `class` that inherit from the `abstract class`.
+* `abstract` **classes** cannot be directly instantiated. Instead the user must create some `class` that inherits from the `abstract class`.
 * `abstract` **members** cannot be directly accessed and a child class must provide the functionality.
 
 ### Constructor is optional