fixing syntax error that was in main branch

Author: eglerean

aalto/jupyterhub-instructors/course-data.rst

@@ -27,8 +27,8 @@ it minimally usable for others.
 **In both cases, you need to** ``chmod -R a+rX`` **the data directory 
 whenever new files or directories are added so that the data becomes
 readable to students.** This can be done either by running
-`chmod -R a+rX` in the Jupyter terminal for each newly added
-file/directory, or by running `chmod -R a+rX /coursedata/*` to
+``chmod -R a+rX`` in the Jupyter terminal for each newly added
+file/directory, or by running ``chmod -R a+rX /coursedata/*`` to
 change permissions for all files at once.
 
 Note: after you are added to relevant group to access the data, it