Correct tense

"is created [...] has not been moved" -> "is created [...] is not moved."

Author: jmbtutor

understanding-git.tex

@@ -467,7 +467,7 @@ \subsection{\gitcmd{branch}}
     \end{tikzpicture}
   \end{figure}
 
-  A branch called \gbranch{newbranch} is created on the current commit and \gHEAD{} has not been moved.
+  A branch called \gbranch{newbranch} is created on the current commit and \gHEAD{} is not moved.
 \end{frame}
 
 \begin{frame}