An edit pass should write this less formally

### Type of issue

Typo

### Description

New developers may not be familiar with some of the object oriented terms used in this article (such as "instantiated").

An edit pass should write this less formally, and introduce those terms with definitions.

### Page URL

https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/abstract-and-sealed-classes-and-class-members

### Content source URL

https://github.com/dotnet/docs/blob/main/docs/csharp/programming-guide/classes-and-structs/abstract-and-sealed-classes-and-class-members.md

### Document Version Independent Id

b93d07bb-44aa-04ef-4b60-0913cb9b1d2f

### Article author

@BillWagner

### Metadata

* ID: 7c48990a-4edb-3e02-f7b7-36edb3eb91c5
* Service: **dotnet-csharp**
* Sub-service: **fundamentals**

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