move EDF note into "how to use"

Author: bcumming

docs/build-install/cpe.md

@@ -17,18 +17,10 @@ The CPE is provided to users on Alps as containers.
 
 ## CPE in a container
 
-!!! info "Before you start"
-    To use the CPE containers as documented below, you need to set the `EDF_PATH` environment variable.
-    ```console
-    export EDF_PATH=/capstor/scratch/cscs/anfink/shared/cpe/edf:$EDF_PATH
-    ```
-    Note that the current location of the EDF files is temporary, to work around a file system bug.
-    The environment variable __will not be required__ once this issue is fixed.
-
 [](){#ref-cpe-versions}
 ### Available versions
 
-The `PrgEnv-gnu` and `PrgEnv-cray` programming environments are provided as separate containers, instead of having both in one container, named `gnu-$version` and `cray-$version` respecively.
+The `PrgEnv-gnu` and `PrgEnv-cray` programming environments are provided as separate containers, instead of having both in one container, named `gnu-$version` and `cray-$version` respectively.
 The `version` is the CPE version in the container.
 
 |                 | `zen2`   | `gh200` |
@@ -41,6 +33,14 @@ The `version` is the CPE version in the container.
 
 ### How to use
 
+!!! info "Before you start"
+    To use the CPE containers as documented below, you need to set the `EDF_PATH` environment variable.
+    ```console
+    export EDF_PATH=/capstor/scratch/cscs/anfink/shared/cpe/edf:$EDF_PATH
+    ```
+    Note that the current location of the EDF files is temporary, to work around a file system bug.
+    The environment variable __will not be required__ once this issue is fixed.
+
 To start a session with the CPE (see [available-versions][ref-cpe-versions] above):
 ```console
 $ srun --environment=cpe-cray-24.07 --pty bash