Improving std.algorithm.find

[sybrandy]

> I think that the problem with find() is not so much find() but it's documentation.
> In all honesty, anything with a return type like FindResult!(Range, Ranges) is
> going to scare people off.

I fully agree.  I had no idea from the documentation what something like 
this was: [1,2,3,4][].  The array documentation doesn't have any 
details, so for the most part I've stayed away from std.algorithm 
because I don't understand the return types very well.  Better 
documentation would help a lot.

Casey