Fix in docs; test 10 - make workflow run

.github/workflows/CI.yml

@@ -84,7 +84,7 @@ jobs:
         with:
           version: '1'
       - uses: julia-actions/julia-buildpkg@v1
-      - name: Prepare env for xvfb
+      - name: Prepare environment for xvfb
         run: |
           sudo apt-get update
           sudo apt-get install -y xorg-dev mesa-utils xvfb libgl1 freeglut3-dev libxrandr-dev libxinerama-dev libxcursor-dev libxi-dev libxext-dev