removed a superfluous 'master'

chap7.tex

@@ -826,7 +826,7 @@ \subsection{Commands}
 \item\texttt{git rebase -i HEAD~3} - Runs the rebase tool interactively for the last three commits
 \item\texttt{git rebase <branchA> <branchB>} - Lift all commits between the common ancestor of branchA and branchB and replay them on top of branchB
 \item\texttt{git branch <branch\_name> <startpoint>} - Create a new branch starting from a definte start point
-\item\texttt{git rebase --onto master <branchC> \newline <branchA> <branchB>} - Lift all commits between the common ancestor of branchA and branchB and replay them on top of branchC
+\item\texttt{git rebase --onto <branchC> \newline <branchA> <branchB>} - Lift all commits between the common ancestor of branchA and branchB and replay them on top of branchC
 \end{itemize}
 
 \subsection{Terminology}