diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index abfc2662b..c8394572d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,16 +8,20 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
 
-      - name: Lint and build documentation
+      - name: Install dependencies
         run: |
           # Install tools used by `_tools/format.sh`.
-          sudo apt-get update -qq
-          sudo apt-get install -qq dos2unix recode
-          # Append the `PATH` so we can run `codespell`.
-          export PATH="$HOME/.local/bin:$PATH"
-          pip3 install -r requirements.txt
-          pip3 install codespell
+          sudo apt-get -qq update
+          sudo apt-get -qq install dos2unix recode
+          sudo pip3 install -r requirements.txt
+          sudo pip3 install codespell
+
+      - name: Linter checks
+        run: |
           bash _tools/format.sh
           codespell -I _tools/codespell-ignore.txt {about,community,development,getting_started,tutorials}/**/*.rst
+
+      - name: Sphinx build
+        run: |
           # Use dummy builder to improve performance.
-          sphinx-build --color -b dummy -d _build/doctrees . _build/html
+          sphinx-build --color -b dummy -d _build/doctrees -W . _build/html
diff --git a/tutorials/3d/csg_tools.rst b/tutorials/3d/csg_tools.rst
index 5de412546..18a6e778a 100644
--- a/tutorials/3d/csg_tools.rst
+++ b/tutorials/3d/csg_tools.rst
@@ -249,7 +249,7 @@ or a city; explore its limitations when designing your game.
 Using prototype textures
 ------------------------
 
-Godot's :ref:`doc_spatial_material` supports *triplanar mapping*, which can be
+Godot's :ref:`doc_standard_material_3d` supports *triplanar mapping*, which can be
 used to automatically apply a texture to arbitrary objects without distortion.
 This is handy when using CSG as Godot doesn't support editing UV maps on CSG
 nodes yet. Triplanar mapping is relatively slow, which usually restricts its