clarify gettingStarted

2019/2019-09-09_testCourseAdv/slides/gettingStarted.md

@@ -5,10 +5,11 @@ Fork and clone the tutorial repository
 $ git clone ssh://git@git-r3lab-server.uni.lu:8022/R3-core/outreach/presentations-internal.git
 ```
 
-Create a new branch off of develop and name it myNameBranch
+Go to the develop branch
 ```bash
 $ git checkout develop
 ```
+And create your own branch using the `-b`flag
 ```bash
 $ git checkout -b myNameBranch
 ```
\ No newline at end of file