fixes a few code style issues and docs issues

docs/usage_guide.rst

@@ -75,18 +75,18 @@ Method 2: Create a StreamField block
 Method 3: Create a template block
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-You can add a template block that only shows it's contents to users of a
+You can add a template block that only shows its contents to users of a
 specific segment. This is done using the "segment" block.
 
-When editing templates make sure to add the `wagtail_personalisation_tags`
-tag to the template::
+When editing templates make sure to load the ``wagtail_personalisation_tags``
+tags library in the template::
 
     {% load wagtail_personalisation_tags %}
 
 After that you can add a template block with the name of the segment you want
 the content to show up for::
 
-    {% segment name="My Segment"}
+    {% segment name="My Segment" %}
         <p>Only users within "My Segment" see this!</p>
     {% endsegment %}
 

src/wagtail_personalisation/templatetags/wagtail_personalisation_tags.py

@@ -10,9 +10,7 @@ register = template.Library()
 
 
 def do_segment(parser, token):
-    """Block that only shows content if user is in chosen segment.
-
-    """
+    """Block that only shows content if user is in chosen segment."""
     # Parse the tag
     tag_name, _, kwargs = parse_tag(token, parser)
 

src/wagtail_personalisation/utils.py

@@ -3,7 +3,6 @@ import time
 from django.template.base import FilterExpression, kwarg_re
 from django.utils import timezone
 
-
 def impersonate_other_page(page, other_page):
     """Function to change the page metadata so the user gets to see the
     non-personalized path and page.