PEP8 correct F401

doc/source/example/database/get_posorients.py

-import pandas as pd
-import numpy as np
-import matplotlib.pyplot as plt
 from navipy.database import DataBaseLoad
 import pkg_resources
 

navipy/database/__init__.py

@@ -14,7 +14,7 @@ How to load a database
 ----------------------
 
 .. literalinclude:: example/database/get_posorients.py
-      :lines: 11
+      :lines: 8
 
 How to load all position-orientation
 ------------------------------------
@@ -26,7 +26,7 @@ position-orientation in the database. More technically \
 speaking, loading the full table of position-orientaiton.
 
 .. literalinclude:: example/database/get_posorients.py
-      :lines: 12-13
+      :lines: 9-10
 
 .. plot:: example/database/get_posorients.py