Improve documentation about bless.

See issue #2077

doc/Type/Mu.pod6

@@ -268,14 +268,15 @@ for more information.
 
     method bless(*%attrinit --> Mu:D)
 
-Lower-level object construction method than C<new>.
+Low-level object construction method, usually called within C<new>.
 
 Creates a new object of the same type as the invocant, uses
 the named arguments to initialize attributes, and returns the
 created object.
 
-You can use this method when writing custom constructors:
+It is usually invoked with custom C<new> method implementations:
 
+=begin code
     class Point {
         has $.x;
         has $.y;
@@ -284,6 +285,7 @@ You can use this method when writing custom constructors:
         }
     }
     my $p = Point.new(-1, 1);
+=end code
 
 (Though each time you write a custom constructor, remember that it makes
 subclassing harder).