[DOCS] Fix spelling (#346)

Author: mteu

Documentation/Quickstart/3-Git.rst

@@ -31,7 +31,7 @@ Quick Start: Set up Git repository
 
     ..  note::
 
-        Remember that we use some convetions for username and email, see
+        Remember that we use some conventions for username and email, see
         :ref:`prerequisite assumptions <quickstart-assumptions>.
 
     ..  code:: bash