Update the documentation to properly outline the parameters required

[doliveirakn]

The documentation around what to do for wrapping an enumerator is incorrect.

It suggests using enumerator_builder.wrap(my_enumerator) however, that isn't the method signature. using this will result in

     ArgumentError:
       wrong number of arguments (given 1, expected 2)

This is because the wrap method actually requires 2 paramters. One is the enumerator, but the other is the enumerator builder itself.

job-iteration/lib/job-iteration/enumerator_builder.rb

Line 23 in b39249b

def wrap(_builder, enum)

I've updated the documentation and the deprecation warning to better reflect that is required.