Apply suggestion from @aignas

Author: aignas

CHANGELOG.md

@@ -74,7 +74,7 @@ END_UNRELEASED_TEMPLATE
 * (toolchains) `py_runtime` and `PyRuntimeInfo` reject Python 2 settings.
   Setting `py_runtime.python_version = "PY2"` or non-None
   `PyRuntimeInfo.py2_runtime` is an error.
-* (pypi) `pipstar` flag has been implemented for `WORKSPACE` and can be flipped to be enabled using `RULES_PYTHON_ENABLE_PIPSTAR=0` environment variable. If you do, please
+* (pypi) `pipstar` flag has been implemented for `WORKSPACE` and can be flipped to be enabled using `RULES_PYTHON_ENABLE_PIPSTAR=1` environment variable. If you do, please
   add a comment to
   [#2949](https://github.com/bazel-contrib/rules_python/issues/2949) if you run into any
   problems.