Fixed documentation issues

src/site/markdown/tutorials/frames.md

@@ -25,9 +25,7 @@ would be better suited. This example is only meant as a basic tutorial.
 
 ### A simple solution
 
-On the one hand, we define the Local Orbital Frame (LOF) related to the satellite.
-
-Let's first define some initial state for the satellite with:
+On the one hand, let's first define some initial state for the satellite with:
 
 * an inertial frame
 * a date in some time scale