Update README.rst

Author: Pradnyaa05

README.rst

@@ -23,7 +23,7 @@ The majority of OSGeoLive documentation is generated from reStructured text (reS
 using Sphinx. reSt is similar to wiki markup, and readable in plain ASCII. As a
 quick check, GitHub will (partially) render reSt documents as HTML.
 
-Build steps
+Building steps
 ~~~~~~~~~~~
 
 Following the steps below on the OSGeoLive Virtual Machine itself is one of the easiest ways