Fixed pip install invalid syntax error

Author: daexs

doc/python/county-choropleth.md

@@ -45,11 +45,11 @@ This page describes a [legacy "figure factory" method](figure-factories.md) for
 
 Run the following commands to install the correct versions of the following modules:
 
-```python
-!pip install plotly-geo==1.0.0
-!pip install geopandas==0.8.1
-!pip install pyshp==2.1.2
-!pip install shapely==1.7.1
+```
+$ pip install plotly-geo==1.0.0
+$ pip install geopandas==1.1.1
+$ pip install pyshp==2.3.1
+$ pip install shapely==2.1.1
 ```
 
 If you are using Windows, follow this post to properly install geopandas and dependencies: http://geoffboeing.com/2014/09/using-geopandas-windows/. If you are using Anaconda, do not use PIP to install the packages above. Instead use conda to install them:

doc/python/tree-plots.md

@@ -37,8 +37,8 @@ jupyter:
 
 Install igraph with `pip install igraph`.
 
-```python
-!pip install igraph
+```
+$ pip install igraph
 ```
 
 ```python