docs: update virtualenv link and command (#1556)

per #1553 (review)

content/docs/command-reference/commit.md

@@ -114,10 +114,10 @@ $ cd example-get-started
 
 Now let's install the requirements. But before we do that, we **strongly**
 recommend creating a
-[virtual environment](https://packaging.python.org/tutorials/installing-packages/#creating-virtual-environments):
+[virtual environment](https://python.readthedocs.io/en/stable/library/venv.html):
 
 ```dvc
-$ virtualenv -p python3 .env
+$ python3 -m venv .env
 $ source .env/bin/activate
 $ pip install -r src/requirements.txt
 ```

content/docs/command-reference/import-url.md

@@ -261,10 +261,10 @@ $ rm -f code.zip
 
 Let's install the requirements. But before we do that, we **strongly** recommend
 creating a
-[virtual environment](https://packaging.python.org/tutorials/installing-packages/#creating-virtual-environments):
+[virtual environment](https://python.readthedocs.io/en/stable/library/venv.html):
 
 ```dvc
-$ virtualenv -p python3 .env
+$ python3 -m venv .env
 $ source .env/bin/activate
 $ pip install -r src/requirements.txt
 ```

content/docs/command-reference/install.md

@@ -135,10 +135,10 @@ $ cd example-get-started
 
 Now let's install the requirements. But before we do that, we **strongly**
 recommend creating a
-[virtual environment](https://packaging.python.org/tutorials/installing-packages/#creating-virtual-environments):
+[virtual environment](https://python.readthedocs.io/en/stable/library/venv.html):
 
 ```dvc
-$ virtualenv -p python3 .env
+$ python3 -m venv .env
 $ source .env/bin/activate
 $ pip install -r src/requirements.txt
 ```

content/docs/install/linux.md

@@ -6,7 +6,7 @@
 ## Install with pip
 
 > We **strongly** recommend creating a
-> [virtual environment](https://packaging.python.org/tutorials/installing-packages/#creating-virtual-environments)
+> [virtual environment](https://python.readthedocs.io/en/stable/library/venv.html)
 > or using
 > [pipx](https://packaging.python.org/guides/installing-stand-alone-command-line-tools/)
 > (on Python 3.6+) to encapsulate your local environment.

content/docs/install/macos.md

@@ -27,7 +27,7 @@ from the [release page](https://github.com/iterative/dvc/releases/) on Github.
 ## Install with pip
 
 > We **strongly** recommend creating a
-> [virtual environment](https://packaging.python.org/tutorials/installing-packages/#creating-virtual-environments)
+> [virtual environment](https://python.readthedocs.io/en/stable/library/venv.html)
 > or using
 > [pipx](https://packaging.python.org/guides/installing-stand-alone-command-line-tools/)
 > (on Python 3.6+) to encapsulate your local environment.

content/docs/install/pre-release.md

@@ -4,7 +4,7 @@ If you want to test the latest stable version of DVC, ahead of official
 releases, you can install it from our code repository Github.
 
 > We **strongly** recommend creating a
-> [virtual environment](https://packaging.python.org/tutorials/installing-packages/#creating-virtual-environments)
+> [virtual environment](https://python.readthedocs.io/en/stable/library/venv.html)
 > or using
 > [pipx](https://packaging.python.org/guides/installing-stand-alone-command-line-tools/)
 > (on Python 3.6+) to encapsulate your local environment.

content/docs/use-cases/versioning-data-and-model-files/tutorial.md

@@ -49,10 +49,10 @@ that will train the model.
 
 Let's now install the requirements. But before we do that, we **strongly**
 recommend creating a
-[virtual environment](https://packaging.python.org/tutorials/installing-packages/#creating-virtual-environments):
+[virtual environment](https://python.readthedocs.io/en/stable/library/venv.html):
 
 ```dvc
-$ virtualenv -p python3 .env
+$ python3 -m venv .env
 $ source .env/bin/activate
 $ pip install -r requirements.txt
 ```

content/docs/user-guide/contributing/core.md

@@ -49,11 +49,11 @@ Python. For Windows, we recommend an official
 
 Install DVC in editable mode with `pip install -e ".[all,tests]"`. But before we
 do that, we **strongly** recommend creating a
-[virtual environment](https://packaging.python.org/tutorials/installing-packages/#creating-virtual-environments):
+[virtual environment](https://python.readthedocs.io/en/stable/library/venv.html):
 
 ```dvc
 $ cd dvc
-$ virtualenv --python python3 .env
+$ python3 -m venv .env
 $ source .env/bin/activate
 $ pip install -e ".[all,tests]"
 ```