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Clarify pythonLocation behavior for PyPy and GraalPy in environment variables (#1183)

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* documentation update

* spaces update
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docs/advanced-usage.md
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@ -477,16 +477,16 @@ jobs:
- run: echo '${{ steps.cp313.outputs.cache-hit }}' # true if cache-hit occurred on the primary key
```
## Environment variables
### Environment variables
These environment variables become available after setup-python action execution:
| **Env.variable** | **Description**|
| ----------- | ----------- |
| pythonLocation |Contains the absolute path to the folder where the requested version of Python or PyPy is installed|
| Python_ROOT_DIR | https://cmake.org/cmake/help/latest/module/FindPython.html#module:FindPython |
| Python2_ROOT_DIR |https://cmake.org/cmake/help/latest/module/FindPython2.html#module:FindPython2|
| Python3_ROOT_DIR |https://cmake.org/cmake/help/latest/module/FindPython3.html#module:FindPython3|
|----------------------|-------------|
| `pythonLocation` | Contains the absolute path to the folder where the requested version of Python, PyPy, or GraalPy is installed. <br><br>**Executable location by implementation:** <br>• **CPython** – `$pythonLocation/bin/python` (Linux/macOS), `$pythonLocation/python.exe` (Windows) <br>• **PyPy** – `$pythonLocation/bin/python` (Linux/macOS), `$pythonLocation/python.exe` (Windows) <br>• **GraalPy** – `$pythonLocation/bin/python` (Linux/macOS) <br><br>Note: CPython versions include a symlink or copy of the Python executable at the root, while PyPy and GraalPy retain upstream directory layouts. |
| `Python_ROOT_DIR` | https://cmake.org/cmake/help/latest/module/FindPython.html#module:FindPython |
| `Python2_ROOT_DIR` | https://cmake.org/cmake/help/latest/module/FindPython2.html#module:FindPython2 |
| `Python3_ROOT_DIR` | https://cmake.org/cmake/help/latest/module/FindPython3.html#module:FindPython3 |
## Using `update-environment` flag