Update text wrenchCalib.md

doc/wrenchCalib.md

@@ -2,7 +2,7 @@
 
 ## Calibration procedure: should be done for each of the arms
 
-**Warning:** This procedure extends each arm to its limit, so at least there should not be any obstacle in a circunference of *1.5* meters.
+**Warning:** This procedure extends each arm to its limit, so at least there should not be any obstacle in a circunference of **1.5** meters.
 
 1. To launch the node that will compute the offsets and move the arm during the calibration run the following ({arm} = {left,right}):