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One more pass on trailing whitespace

Signed-off-by: Katherine Scott <[email protected]>

source/Tutorials/Intermediate/RViz/RViz-Custom-Panel/RViz-Custom-Panel.rst

@@ -176,9 +176,9 @@ This should create a new panel in your RViz window, albeit with nothing but a ti
 Filling in the Panel
 --------------------
 We're going to update our panel with some very basic ROS/QT interaction.
-What we will do, roughly, is create something like a ROS node within RViz that can both subscribe and publish to ROS topics. 
-We will use our subscriber to monitor an `\input` topic within ROS and print published `String` values to the screen. 
-We use our publisher to map button presses within RViz to messages published on a ROS topic named `\output` . 
+What we will do, roughly, is create something like a ROS node within RViz that can both subscribe and publish to ROS topics.
+We will use our subscriber to monitor an `\input` topic within ROS and print published `String` values to the screen.
+We use our publisher to map button presses within RViz to messages published on a ROS topic named `\output` .
 We use our publisher to map button presses within RViz to messages published on a ROS topic named ``/output`` .
 
 Updated Header File