Update OpenCL activation instructions. [ci skip]

Author: lohedges

README.rst

@@ -145,14 +145,13 @@ you haven't created this file.)
 
 If you need OpenCL support (e.g. for OpenMM), note that pixi does not run
 conda post-link scripts, so the ``ocl-icd-system`` symlink won't be created
-automatically. Add the following to your ``pixi.sh`` to fix this:
+automatically. After creating the environment, run the following once to fix
+this:
 
 .. code-block:: bash
 
-    # Create OpenCL ICD symlink (pixi doesn't run post-link scripts)
-    if [ -d /etc/OpenCL/vendors ] && [ ! -e "${CONDA_PREFIX}/etc/OpenCL/vendors/ocl-icd-system" ]; then
-        ln -s /etc/OpenCL/vendors "${CONDA_PREFIX}/etc/OpenCL/vendors/ocl-icd-system" 2>/dev/null || true
-    fi
+    pixi shell -e dev
+    ln -s /etc/OpenCL/vendors "${CONDA_PREFIX}/etc/OpenCL/vendors/ocl-icd-system"
 
 Support and Development
 =======================

doc/source/install.rst

@@ -335,14 +335,13 @@ you haven't created this file.)
 
 If you need OpenCL support (e.g. for OpenMM), note that pixi does not run
 conda post-link scripts, so the ``ocl-icd-system`` symlink won't be created
-automatically. Add the following to your ``pixi.sh`` to fix this:
+automatically. After creating the environment, run the following once to fix
+this:
 
 .. code-block:: bash
 
-    # Create OpenCL ICD symlink (pixi doesn't run post-link scripts)
-    if [ -d /etc/OpenCL/vendors ] && [ ! -e "${CONDA_PREFIX}/etc/OpenCL/vendors/ocl-icd-system" ]; then
-        ln -s /etc/OpenCL/vendors "${CONDA_PREFIX}/etc/OpenCL/vendors/ocl-icd-system" 2>/dev/null || true
-    fi
+    pixi shell -e dev
+    ln -s /etc/OpenCL/vendors "${CONDA_PREFIX}/etc/OpenCL/vendors/ocl-icd-system"
 
 Compile and install
 -------------------