[Issue 19067] [Mixins] Dead Link to template-mixin

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19067

desisma at heidel.beer changed:

           What    |Removed                     |Added
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                URL|http://dlang.org/           |https://dlang.org/articles/
                   |                            |mixin.html

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