Change index.md

Author: gwangmu

docs/software/container-engine/index.md

@@ -26,7 +26,7 @@ Through the EDF, container use cases can be abstracted to the point where end us
 
 Let's set up a containerized Ubuntu 24.04 environment on the scratch folder (`${SCRATCH}`).
 
-### Step 1. Create EDF
+### Step 1. Create an environment 
 
 Save this file below as `ubuntu.toml` in `${HOME}/.edf` directory (the default location of EDF files).
 A more detailed explanation of each entry for the EDF can be seen in the [EDF reference][ref-ce-edf-reference].
@@ -40,7 +40,7 @@ workdir = "/capstor/scratch/cscs/${USER}"
 !!! note
     Create `${HOME}/.edf` if the folder doesn't exist.
 
-### Step 2. Launch a program with EDF
+### Step 2. Launch a program 
 
 Use Slurm on the login node to launch a program inside the environment.
 Notice that the environment (EDF) is specified with the `--environment` option.