hexadecimal commit refs

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

-## Git Cherry-pick
+## Cherry-picking
 
 * Cherry picking is another very useful tool to work with.
 * It enables the user to pick specific commits from a list of commits.

2019/2019-09-09_testCourseAdv/slides/rebase-iPresentation3.md

@@ -3,18 +3,18 @@
 The prompt shows up:
 
 ```bash
-$ pick 93fshjw add first name to attendee list
-$ pick 47fh35f add second name to attendee list
+$ pick 1234567 add first name to attendee list
+$ pick 890abcd add second name to attendee list
 ```
 
 The keywords should be changed to:
 
 ```bash
-$ reword 93fshjw add first name to attendee list
-$ fixup 47fh35f add second name to attendee list
+$ reword 1234567 add first name to attendee list
+$ fixup 890abcd add second name to attendee list
 ```
 
-Upon confirming, change the message of commit 93fshjw:
+Upon confirming, change the message of commit 1234567:
 
 ```bash
 $ Add Name1 and Name2 to the attendee list