docs: add example if statement (with single-quote gotcha)

Author: lrq3000

docs/advanced-usage.md

@@ -204,7 +204,7 @@ jobs:
 
 ### Matrix Testing
 
-Using `setup-python` it's possible to use [matrix syntax](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstrategymatrix) to install several versions of Python or PyPy:
+Using `setup-python` it's possible to use the [matrix syntax](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstrategymatrix) to install several versions of Python or PyPy:
 
 ```yaml
 jobs:
@@ -233,7 +233,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['2.7', '3.7', '3.8', '3.9', '3.10', 'pypy2.7', 'pypy3.8']
+        python-version: ['2.7', '3.7', '3.8', '3.9', '3.10', '*', 'pypy2.7', 'pypy3.8']
         exclude:
           - os: macos-latest
             python-version: '3.8'
@@ -246,9 +246,24 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - name: Display Python version
+        if: ${{ python-version != 'pypy2.7' && python-version != '*' }} # in GitHub workflows if statements, use single-quotes (not double-quotes) in expressions to test input `python-version`
         run: python --version
 ```
 
+```yaml
+strategy:
+  fail-fast: false
+  matrix:
+    python-version: ["3.7", "3.8", "3.10", "*", "3.12-dev"]
+steps:
+- uses: actions/checkout@v3
+- uses: actions/setup-python@v4
+  with:
+    python-version: ${{ matrix.python-version }}
+
+  run: python my_script.py
+```
+
 ## Using the `python-version-file` input
 
 `setup-python` action can read Python or PyPy version from a version file. `python-version-file` input is used for specifying the path to the version file. If the file that was supplied to `python-version-file` input doesn't exist, the action will fail with error.