Adds text I had deleted for no reason

doc/Language/structures.pod6

@@ -279,11 +279,11 @@ say %hash-plus.sort[0]; # OUTPUT: «3 => 33»
 say %hash-plus.last;    # OUTPUT: «4 => 44»
 =end code
 
-In C<Lastable> we use the universal C<self> variable to refer to
-whatever object this particular role is mixed in; in this case it will
-contain the hash it is mixed in with; it will contain something else
-(and possibly work some other way) in other case. This role will provide
-the C<last> method to any variable it's mixed with, providing new,
+In C<Lastable> we use the universal C<self> variable to refer to whatever object
+this particular role is mixed in; in this case it will contain the hash it is
+mixed in with; it will contain something else (and possibly work some other way)
+in other case. This role will provide the C<last> method to any variable it's
+mixed with, providing new, attachable, functionalities to I<regular> variables.
 
 L<Subsets|/language/typesystem#subset> can also be used to constrain the
 possible values a variable might hold; they are Perl 6 attempt at