Mention ｢my %h{Int}｣ syntax when talking about non-string keys

[AlexDaniel]

See https://docs.perl6.org/type/Hash#Non-string_keys

There's a little useful hint on https://docs.perl6.org/type/Hash#method_keyof:

my %h2{Str} = 'oranges' => 7;            # (keys must be of type Str)

But it's hard to find it from “Non-string keys” section.

[BenGoldberg1]

It might also be worthwhile to also mention hashes with no restriction on keys my %h3{Any};

[tisonkun]

I think this mention some of it: https://docs.perl6.org/type/Hash#Object_hashes_and_type_constraints
while it gets a wrong hierarchy in the doc -- it is below `Looping over hash keys and values'

[tisonkun]

@AlexDaniel #1602 may fix it, and this issue can be closed

[AlexDaniel]

I think it is a bit convoluted and hard to read, but indeed this issue is resolved. I'll leave this open for just a little bit in case someone has any thoughts on how to reword it so that it reads better, but otherwise this can be closed.

[tisonkun]

@AlexDaniel Yes, maybe it can be rewritten using more simple examples.