make the changes into docs

Author: No767

docs/dev-guide/intro.rst

@@ -67,7 +67,7 @@ Setup
 .. code-block:: bash
 
    pip install -r requirements-dev.txt \
-   && pre-commit install
+   && lefthook install 
 
 5. Copy over the ``config-example.yml`` template over to the ``bot`` directory. Modify the values as appropriate.