GitHub Actions: Increase timeout to 240 minutes for offline documentation builds

Building the offline documentation 6 times (3 HTML, 3 ePub) takes
a long time on a GitHub Actions shared runner. 3 hours doesn't
always suffice anymore, so increasing it to 4 hours should fix
CI failures for the foreseeable future.

Author: Calinou

.github/workflows/build_offline_docs.yml

@@ -12,7 +12,7 @@ jobs:
     # Manual runs can still be triggered as normal.
     if: ${{ github.repository_owner == 'godotengine' || github.event_name != 'schedule' || vars.CI_OFFLINE_DOCS_CRON == 'true' }}
     runs-on: ubuntu-24.04
-    timeout-minutes: 180
+    timeout-minutes: 240
     strategy:
       max-parallel: 1
       fail-fast: false

tutorials/3d/global_illumination/using_voxel_gi.rst

@@ -121,6 +121,15 @@ There are 3 global illumination modes available for meshes:
   This option is much slower compared to **Static**. Only use the **Dynamic**
   global illumination mode on large meshes that will change significantly during gameplay.
 
+.. note::
+
+    For meshes with the **Static** bake mode, the VoxelGI baking system is not able
+    to make use of custom shaders. These will be considered to be pure black,
+    only acting as light blockers.
+
+    You can make custom shaders taken into account by using the **Dynamic** bake mode
+    for these objects, but this has a perforrance cost.
+
 Additionally, there are 3 bake modes available for lights
 (DirectionalLight3D, OmniLight3D and SpotLight3D):