The path should be changed in session04/step01.md

We should ensure that we are using the same file organization along the tutorials.
In session04/step01.md the file SAOUHSC.bed should be somewhere in /shared/data/bank...

Here is the code to be changed:

<Execute command="ls" />
<Execute command="ls Data" />
<Execute command="cd Data" />
<Execute command="grep SAOUHSC_00079 SAOUHSC.bed" />