`SpinWait` example ignores compiler HW/optimization

[deep-outcome]

If I am not wrong example:

• page
• src

shows incorrect usage. Examples should be complete, understandable and most importantly correct.

Since someBoolean is accessed by multiple threads, it must be provided with synchronization manner for r/w ops. Similar example can be seen in volatile (C# Reference) page. This one explicitly points out need for synchronization between threads.