Add info to 5to6-perlfunc.rakudoc at each HASH

Mentioning that there are Pair objects, so more possibilities, and specifically `.pairs` and `.antipairs`.

Author: 0rir

doc/Language/5to6-perlfunc.rakudoc

@@ -431,9 +431,12 @@ According to S29, C<dump> has been... dumped.
 
 =item each HASH
 
-There is no exact equivalent, but you can use C<%hash.kv> which
-returns a list of keys and values. For example:
+There is no exact equivalent, because in Raku Hashes are composed of Pair objects.
+You can use C<%hash.kv> which
+returns a list of keys and values. example:
 C«for %hash.kv -> $k, $v { say "$k: $v" }».
+However Raku offers more possibilities, C<%hash.pairs> gives you each Pair object as
+as an entity, and C<%hash.antipairs> does the same with the keys and values reversed.
 
 Incidentally, what we have there with the C«->» is called a pointy
 block and, though there are a number of examples in the documentation,