Update HtmlToken.cs
Update HtmlToken.cs

The sentence:

> Removes **the a new** line in the beginning, if any.

Should read not have the word "a":

> Removes **the new** line in the beginning, if any.
AngleSharp/AngleSharp,AngleSharp/AngleSharp,AngleSharp/AngleSharp,AngleSharp/AngleSharp,AngleSharp/AngleSharp