improve stereo calibration tutorial (backport #1065)

[mergify]

• make topic names consistent by removing the my_ prefix on some topics
• show the output of ros2 service list so that service names are more clear
• explain what left/right/left_camera/right_camera actually mean

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  This is an automatic backport of pull request improve stereo calibration tutorial #1065 done by Mergify.

[mergify]

Cherry-pick of e00d008 has failed:

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	deleted by us:   camera_calibration/doc/tutorial_stereo.rst

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