Proposal to explain the copy trait more clearly

As mentioned in #25893 the copy trait is not very well explained for beginners. There is no clear mention that all primitive types implement the copy trait and there are not a lot of examples. 

With this change I try to make it more visible and understandable for new users. 

I myself have struggled with this, see [my question on stackoverflow](http://stackoverflow.com/questions/30540419/why-are-booleans-copyable-even-though-the-documentation-doesnt-indicate-that). And I want to make it more transparent for others. 

I filed issue #25893 but I thought that I could give it a shot myself to relieve some of the work from the devs :)

If it is not well written or there are some changes to be made before it can be merged, let me know.

Cheers,
Mathieu

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