Minor API docs improvements

- Hide "Bases" below class signatures
- Leave some empty space after tables

docs/conf.py

@@ -12,7 +12,6 @@ extensions = [
     'sphinx.ext.todo',
 ]
 autodoc_default_flags = [
-    'show-inheritance',
     'undoc-members',
 ]
 autodoc_member_order = 'groupwise'

stix2/markings/__init__.py

@@ -12,9 +12,7 @@ granular markings unless otherwise noted in each of the functions.
    object_markings
    utils
 
-.. raw:: html
-
-   <br/><hr/><br/>
+|
 """
 
 from stix2.markings import granular_markings, object_markings

stix2/sources/__init__.py

@@ -8,6 +8,7 @@
    memory
    taxii
 
+|
 """
 
 import uuid