Correct typo in example Python module option

python.install_env is the correct command, as documented
in https://mesonbuild.com/Builtin-options.html#python-module.

python.install_venv causes an error, it is not immediately obvious
that the slight typo is the cause.

docs/markdown/Python-module.md

@@ -18,7 +18,7 @@ compatible with [PEP-517](https://peps.python.org/pep-0517/), check out
 
 If you are building Python extension modules against a Python interpreter
 located in a venv or Conda environment, you probably want to set
-`python.install_venv=auto`;
+`python.install_env=auto`;
 see [Python module options](Builtin-options.md#python-module) for details.
 
 *Added 0.46.0*