Use https: for wikipedia links

[Walter Bright via Digitalmars-d]

I just did this PR for the web site:

     https://github.com/D-Programming-Language/dlang.org/pull/1166

The next step is to similarly adjust all the wikipedia links in the Phobos 
documentation. Most are one of the forms:

     $(LINK http://en.wikipedia.org/wiki/Adler-32)
     $(LINK2 http://en.wikipedia.org/wiki/Unicode, Wikipedia)
     $(WEB en.wikipedia.org/wiki/Julian_day, Julian day)

To fix it, I suggest a new macro be created, WEBS, that does https:// and then 
all the wikipedia links be replaced with WEBS links.


As a general rule, all links in the documentation should be tested to see if 
they support https://, and if so, modified to use it.

Who is up for doing this?