Fixes description of lazy statement prefix, refs #534 #2034

Thanks for @jnthn clarification in Raku/roast#529

doc/Language/statement-prefixes.pod6

@@ -11,8 +11,9 @@ to some statement or statements.
 
 =head2 X<C<lazy>|lazy (statement prefix)>
 
-As a statement prefix, lazy acts on C<for> loops, saving the execution for when
-the variable they are assigned for is actually needed.
+As a statement prefix, lazy acts in front of any statement, including C<for>
+loops, saving the execution for when the variable they are assigned for is
+actually needed.
 
 =for code
 my $incremented = 0;
@@ -28,6 +29,11 @@ the loop is only run, when we eagerly evaluate the variable C<$var> that
 contains the lazy loop. Eagerness can be applied on a variable in other ways,
 such as calling the C<.eager> method on it.
 
+=for code
+my @array = lazy { (^3).map( *² )  };
+say @array;       # OUTPUT: «[...]»
+say @array.eager; # OUTPUT: «[0 1 4]␤» 
+
 This prefix can also be used
 L<in front of C<gather>|/language/control#gather/take> to make the inner
 statements behave lazily.