Update rmw_get_serialized_message_size docblock

[ahcorde]

Update rmw_get_serialized_message_size docblock to return the right error code.

Signed-off-by: ahcorde ahcorde@gmail.com

[ahcorde]

Related:

• https://github.com/ros2/rmw_fastrtps/pull/452
• https://github.com/ros2/rmw_connext/pull/467
• https://github.com/ros2/rmw_cyclonedds/pull/250

[ahcorde]

• Linux
• Linux-aarch64
• macOS
• Windows