3988 – Provide canonical example for operator overloading

At first glance, the new operator overloading syntax looks cumbersome by comparison to C++. Adding the following example to the D docs would make it clear what the advantage of the new syntax is, as well as not requiring people to reinvent it repeatedly:
http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmars.D&article_id=101636
2. Use one mixin expression:
T opBinary(string op)(T rhs) {
 return mixin("data "~op~" rhs.data");
}

Commit pushed to https://github.com/D-Programming-Language/d-programming-language.org
https://github.com/D-Programming-Language/d-programming-language.org/commit/ed45694454cf1510110d1ac57308841213c89780
fix Issue 3988 - Provide canonical example for operator overloading