polish starting instructions

src/docs/part1/simple_detector.md

@@ -21,10 +21,14 @@ load the pre-compiled detector plugins from the container with*
 source /opt/detector/setup.sh
 ```
 
-First start by cloning part 1 of the tutorial. Start from the top level directory we created in getting started.
+Start from the top level directory we created the Quick Start, which is `~/eic` in our example.
+```bash
+cd ~/eic
+```
+
+First start by cloning part 1 of the tutorial.
 
 ```bash
-cd eic
 git clone https://eicweb.phy.anl.gov/EIC/tutorials/ip6_tutorial_1.git part1
 cd part1
 ```