Add missed comment annotation

[peter279k]

Description

• It's the enhancement work
• I think we can some comment annotations for these methods in Name class

Your environment

• latest master branch
• Linux/Ubuntu 18.04
• PHP 7.1

Context

I think it can let developers know about every method usages via every comment annotations.

Possible implementation

The possible implementation approaches are as follows:

• Following the PHPDocument style to write the comment annotations.
• The approach about writing comment annotation can refer the NhsNumber class in this repository.

[imliam]

Feel free to raise a merge request if you feel some of the method names are not clear - but as it stands I think each method name represents itself well enough that a comment would not be beneficial.