docs: fix method call in dtos.md code example
docs: fix method call in dtos.md code example

The dtos Code example was calling `getBundle` where it
(probably) was supposed to call `toDTO`.

Signed-off-by: Radford Nguyen <c80c85c60a14fdb113b4d7b4a2ac141251bab36b@gmail.com>

osgi/osgi.enroute.site,osgi/osgi.enroute.site,osgi/osgi.enroute.site