refine documents (#886)

doc/faq.md

@@ -458,17 +458,24 @@ The specific version information:
 |:--------------:|:-------------:|:--------:|
 |    3.0.6370    |     3.5.1     |  12.20   |
 
+The path of Python virtual environment within "@autorest/python" extension should be like:
+```text
+~/.autorest/@autorest_python@xx/node_modules/@autorest/python/venv
+```
+
 > ModuleNotFoundError: No module named 'm2r'
-1. Active the Python virtual environment within "@autorest/python" extension;
+
+1. Active the virtual environment within "@autorest/python";
 2. Execute `pip install m2r`;
 
 > AttributeError: module 'mistune' has no attribute 'BlockGrammar'
-1. Active the Python virtual environment within "@autorest/python" extension;
+
+1. Active the virtual environment within "@autorest/python";
 2. Execute `pip install mistune==0.8.4`;
 
 > Failed to install or start extension '@autorest/az'
 
 Specify the version of Node.js to **12.20** and the command should be like:
-```
+```text
 $ autorest --version=3.0.6370 --az --use=@autorest/az@latest <path-to-the-swagger-readme.md> --azure-cli-extension-folder=<path-to-the-azure-cli-extension-repo>
 ```