doc(readme): fix typos

README.md

-## MechaRaptor - Reports
+## MechaRaptor - Documentation
 
 The MechaRaptor is a medium-size, high frequency tandem flapping wing system
 developed by Thomas Lambert at the University of Liège during his Ph.D. thesis.
 
-This repository contains the various reports related to the operation of the
+This repository contains the various reports related to the operation of
 this flapping device. The reports are:
 
 - Safety assessment