content: add comment about << in range example
The 'Range Continued' code example uses a left shift operator.
Some people are unfamiliar with shift, and being puzzled about
what it means can distract from the point--which is range.
Per a suggestion from gri, this adds a small comment to show that
it's equivalent to 2**n.
Reviewed-by: Robert Griesemer <email@example.com>
1 file changed