Index enumerations in typesystem.pod per gh #87

Author: pdl

doc/Language/typesystem.pod6

@@ -147,6 +147,8 @@ TODO
 
 =head2 C<enum>
 
+X<|Enumeration; Enums; enum>
+
 Enumerations provide constant key-value-pairs with an associated type. Any key
 is of that type and injected as a symbol into the current scope. If the symbol
 is used, it is treated as a constant expression and the symbol is replaced with