Plane: changes in Ardupilot Project introduction

Made some changes in the introduction. Changes include removal of unnecessary comma and correcting the spelling mistakes.

README.md

@@ -14,11 +14,10 @@
 
 [![Autotest Status](https://autotest.ardupilot.org/autotest-badge.svg)](https://autotest.ardupilot.org/)
 
-Ardupilot is the most advanced, full-featured and reliable open source autopilot software available. It has
+ArduPilot is the most advanced, full-featured and reliable open source autopilot software available.
-been under development since 2010 by a diverse team of professional engineers, computer scientists and community contributors.
+It has been under development since 2010 by a diverse team of professional engineers, computer scientists and community contributors.
-Our autopilot software is capable of controlling almost any vehicle system imaginable, from conventional
+Our autopilot software is capable of controlling almost any vehicle system imaginable, from conventional airplanes, quad planes, multi-rotors, and helicopters to rovers, boats, balance bots and even submarines.
-airplanes, quadplanes, multirotors, and helicopters, to rovers, boats, balancebots and even submarines. It is continually being expanded to provide
+It is continually being expanded to provide support for new emerging vehicle types.
-support for new emerging vehicle types.
 
 ## The ArduPilot project is made up of: ##