Update venv detail

pages/requirement/venv.md

@@ -14,7 +14,41 @@ When a project is no longer needed, deleting its virtual environment is straight
 
 ## How it works?
 
-When you run `python3 -m venv your_venv_directory_name`, Python creates a directory for “A mini Python install just for this project”. When you activate it with `source .venv/bin/activate`, your shell is told "When I type `python` or `pip`, use the ones inside `.venv`", Nothing else changes. So, when you type `pip install requests`, it installs only inside `.venv`. Then, you can deactivate venv with `deactivate` command.
+When you run:
+
+```sh
+python3 -m venv your_venv_directory_name
+```
+
+Python creates a directory for *“A mini Python install just for this project”*. 
+
+When you activate it with
+
+```sh
+source your_venv_directory_name/bin/activate
+```
+
+You should see
+
+```sh
+(your_venv_directory_name)
+```
+
+your shell is told *"When I type `python` or [pip](pages/requirement/pip.md), use the ones inside `your_venv_directory_name`"*, Nothing else changes. 
+
+So, when you type:
+
+```sh
+pip install requests
+```
+
+it installs only inside `your_venv_directory_name`. 
+
+Then, you can deactivate venv with this command:
+
+```sh
+deactivate
+```
 
 ## Why I add `venv` on my `gitignore`?