Update chapter-14.rst (#819)

Quick fix for two errors:
1)
"GridClassStyleBulma" is not accessedPylance
(class) GridClassStyleBulma
The Grid style for Bulma

2)
"FormStyleBulma" is not accessedPylance
(variable) FormStyleBulma: FormStyleFactory

docs/chapter-14.rst

@@ -38,8 +38,8 @@ Create a new minimal app called ``grid``. Change it with the following content.
    # in grid/__init__.py
    import os
    from py4web import action, Field, DAL
-   from py4web.utils.grid import Grid, GridClassStyleBulma
-   from py4web.utils.form import Form, FormStyleBulma
+   from py4web.utils.grid import *
+   from py4web.utils.form import *
    from yatl.helpers import A
 
 
@@ -583,4 +583,4 @@ combine fields to be displayed together as the filter_out method would
 
 You need to determine which method is best for your use case
 understanding the different grids in the same application may need to
-behave differently.
+behave differently.