run_your_first_tank_design.md: Unified information on some nodes in the acXML.

docs/documentation/sizing/tank_design/run_your_first_tank_design.md

@@ -124,7 +124,7 @@ Aircraft exchange file
 
 <sup>*</sup> Node has been shortened. It contains the following sub-nodes: x, y, z
 
-<sup>**</sup> Node has been shortened. It contains information on the mass, inertia, and center of gravity.
+<sup>*</sup> Node has been shortened. It contains sub-nodes with information on the mass, inertia, and center of gravity.
 
 ## Troubleshooting {#troubleshooting}
 - The tool does not run properly? *Make sure you have all the paths set up correctly and the specified elements exist.*