doc: update configuration.md (#1262)

docs/docs/usage/configuration.md

@@ -17,7 +17,7 @@ The following configuration items can be retrieved and modified by [`pdm config`
 | `project_max_depth`               | The max depth to search for a project through the parents                 | 5                                                                         | No                   | `PDM_PROJECT_MAX_DEPTH`  |
 | `python.path`                     | The Python interpreter path                                               |                                                                           | Yes                  | `PDM_PYTHON`             |
 | `python.use_pyenv`                | Use the pyenv interpreter                                                 | `True`                                                                    | Yes                  |                          |
-| `python.use_venv`                 | Install packages into the activated venv site packages instead of PEP 582 | `False`                                                                   | Yes                  | `PDM_USE_VENV`           |
+| `python.use_venv`                 | Install packages into the activated venv site packages instead of PEP 582 | `True`                                                                   | Yes                  | `PDM_USE_VENV`           |
 | `pypi.url`                        | The URL of PyPI mirror                                                    | `https://pypi.org/simple`                                                 | Yes                  | `PDM_PYPI_URL`           |
 | `pypi.verify_ssl`                 | Verify SSL certificate when query PyPI                                    | `True`                                                                    | Yes                  |                          |
 | `pypi.json_api`                   | Consult PyPI's JSON API for package metadata                              | `False`                                                                   | Yes                  | `PDM_PYPI_JSON_API`      |