Fix a list numbering problem in docs

Recent changes introduced a numbered list that was being interpreted as two separate numbered lists instead of one.  This fixes that by indenting the content between the two list entries.  Now the list items are numbered 1 and 2 rather than 1 and 1.

Author: david-macmahon

docs/src/installation/overview.md

@@ -128,16 +128,16 @@ only select artifacts that are compatible with the configured CUDA runtime.
 
 1. Generates the following `LocalPreferences.toml` file in your active environment:
 
-```
-[CUDA_Runtime_jll]
-version = "11.8"
-```
+   ```
+   [CUDA_Runtime_jll]
+   version = "11.8"
+   ```
 
 2. Ensures the following line is in the `[extras]` section of your active `Project.toml` file to allow `Preferences.jl` to find the `version` preference for `CUDA_Runtime_jll`:
 
-```
-CUDA_Runtime_jll = "76a88914-d11a-5bdc-97e0-2f5a05c973a2"
-```
+   ```
+   CUDA_Runtime_jll = "76a88914-d11a-5bdc-97e0-2f5a05c973a2"
+   ```
 
 ### Using a local CUDA