add an error hint for min/max on an iterable

[KristofferC]

Inspired by the discussion in https://discourse.julialang.org/t/max-of-a-vector/108294/15

julia> max([1,2,3])
ERROR: MethodError: no method matching max(::Vector{Int64})
Finding the minimum or maximum element of an array is performed with `minimum` and `maximum` respectively.
....

julia> max([1,2,3])
ERROR: MethodError: no method matching max(::Vector{Int64})
Finding the minimum or maximum element of an array is performed with `minimum` and `maximum` respectively.
....

[stevengj]

Should there be a test?

[aplavin]

Wow, errorhints are great!
Maybe also add another direction? For

julia> maximum(1,2,3)
ERROR: MethodError: no method matching maximum(::Int64, ::Int64, ::Int64)