Grammar and clarity improvements.

docs/source/dev/formatters.rst

@@ -4,7 +4,7 @@
  Developing a Formatting Plugin for Flake8
 ===========================================
 
-Flake8 added the ability to develop custom formatting plugins in version
+Flake8 allowed for custom formatting plugins in version
 3.0.0. Let's write a plugin together:
 
 .. code-block:: python

docs/source/dev/index.rst

@@ -4,9 +4,9 @@
 
 Since Flake8 2.0, the Flake8 tool has allowed for extensions and custom
 plugins. In Flake8 3.0, we're expanding that ability to customize and
-extend **and** we're attempting to thoroughly document it too. Some of the
+extend **and** we're attempting to thoroughly document it. Some of the
 documentation in this section will reference third-party documentation
-in order to reduce duplication and to point you, the developer, towards
+to reduce duplication and to point you, the developer, towards
 the authoritative documentation for those pieces.
 
 .. toctree::

docs/source/dev/registering_plugins.rst

@@ -4,9 +4,9 @@
  Registering a Plugin with Flake8
 ==================================
 
-To register any kind of plugin with Flake8, you need a few things:
+To register any kind of plugin with Flake8, you need:
 
-#. You need a way to install the plugin (whether it is packaged on its own or
+#. A way to install the plugin (whether it is packaged on its own or
    as part of something else). In this section, we will use a ``setup.py``
    written for an example plugin.
 
@@ -15,7 +15,7 @@ To register any kind of plugin with Flake8, you need a few things:
 #. A somewhat recent version of setuptools (newer than 0.7.0 but preferably as
    recent as you can attain).
 
-Flake8 presently relies on a functionality provided by setuptools called
+Flake8 relies on functionality provided by setuptools called
 `Entry Points`_. These allow any package to register a plugin with Flake8 via
 that package's ``setup.py`` file.