Moving 'enum-pair' definitions to its real place, Enumeration

doc/Language/typesystem.pod6

@@ -775,48 +775,11 @@ Defined as:
 
     method enums()
 
-Returns the list of enum-pairs. Works both on the enum type and any key.
+Returns the list of enum-pairs.
 
     enum Mass ( mg => 1/1000, g => 1/1, kg => 1000/1 );
     say Mass.enums; # OUTPUT: «{g => 1, kg => 1000, mg => 0.001}␤»
 
-=head4 method key
-
-Returns the key of an enum-pair.
-
-=for code :preamble<<enum Mass<g> >>
-say g.key; # OUTPUT: «g␤»
-
-=head4 method value
-
-Returns the value of an enum-pair.
-
-=for code :preamble<<enum Mass<g> >>
-say g.value; # OUTPUT: «1␤»
-
-=head4 method pair
-
-Defined as:
-
-=for code
-method pair(::?CLASS:D:)
-
-Returns the enum-pair as a C<Pair>.
-
-=for code :preamble<<enum Mass<g> >>
-say g.pair; # OUTPUT: «g => 1␤»
-
-=head4 method kv
-
-Defined as:
-
-=for code
-multi method kv(::?CLASS:D:)
-
-Returns a list with key and value of the enum-pair.
-
-=for code :preamble<<enum Mass<g> >>
-say g.kv; # OUTPUT: «(g 1)␤»
 
 =head3 Coercion