C# 6.0 Feature: using static (#9)

* updates for using static

Current spec text for using static

proofread fixes

* add example for inheritance and static using

I chose to use non-descript names rather than provide an example from the class library. I think that's sufficient to understand, and doesn't beg more questions about the design decision (even in an informative example).

* fix duplicate header

* fix CI build

* fix build warning

* Apply suggestions from code review

Co-authored-by: Jon Skeet <[email protected]>

* respond to feedback

* braces on end of line

I wanted to check other clauses in the standard to compare. Jon is correct.

* respond to public feedback.

* Format samples

Make the following changes to the code samples in this clause:

- Add a blank line between peer elements *except* for multiple `using` directives and multiple `alias` directives. (I did add a blank line between `using` and `alias` directives.
- Use Allman brace style on non-empty `class` declarations. (I'd prefer using Allman brace style on methods, but the standard currently uses K&R style for methods consistently.

Co-authored-by: Jon Skeet <[email protected]>

Author: BillWagner