[doc] Fix jsk_topic_tools/Passthrough doc Usage section #1795
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This PR fixes jsk_topic_tools/Passthrough documentation.
In https://github.com/jsk-ros-pkg/jsk_common/blob/78faabe470fe02567e215a05a752e7c1d97e16a6/jsk_topic_tools/launch/passthrough_sample.launch ,
remap topic uses
~
something like '~input', so input topic and output topic don't have a namespace from the node name.