reorganize fragment of git diff

2019/2019-06-11_gitTraining/slides/essential_commands.md

@@ -54,13 +54,6 @@ $ git status
 # uncommitted changes (displayed in red)
 ```
 
-<div class="fragment">
-
-**ADVANCED**: see your changes in the terminal
-```bash
-$ git diff
-```
-exit with `q`
 
 <div class="fragment">
 
@@ -71,6 +64,14 @@ $ git status
 # returns the same as before, generally in green (means staged)
 ```
 
+<div class="fragment">
+
+**ADVANCED**: If there have been more changes after the file has been added, you can see your changes in the terminal
+```bash
+$ git diff
+```
+exit with `q`
+
 
 
 ## Add a commit message