Add wording improvements to the docs

Author: rmk135

docs/providers/aggregate.rst

@@ -10,7 +10,7 @@ Aggregate provider
                  This page demonstrates how to implement the polymorphism and increase the
                  flexibility of your application using the Aggregate provider.
 
-:py:class:`Aggregate` provider aggregates other providers.
+:py:class:`Aggregate` provider aggregates a group of other providers.
 
 .. currentmodule:: dependency_injector.providers
 
@@ -20,7 +20,7 @@ Aggregate provider
    :emphasize-lines: 24-27
 
 Each provider in the ``Aggregate`` is associated with a key. You can call aggregated providers by providing
-their key as a first argument. All positional and keyword arguments after the key will be forwarded to
+their key as a first argument. All positional and keyword arguments following the key will be forwarded to
 the called provider:
 
 .. code-block:: python
@@ -33,7 +33,7 @@ You can also retrieve an aggregated provider by providing its key as an attribut
 
    yaml_reader = container.config_readers.yaml("./config.yml", foo=...)
 
-To retrieve a dictionary of aggregated providers with their associated keys, use ``.providers`` attribute:
+To retrieve a dictionary of aggregated providers, use ``.providers`` attribute:
 
 .. code-block:: python
 
@@ -46,7 +46,7 @@ To retrieve a dictionary of aggregated providers with their associated keys, use
    You can not override the ``Aggregate`` provider.
 
 .. note::
-   When you inject the ``Aggregate`` provider it is passed "as is".
+   When you inject the ``Aggregate`` provider, it is passed "as is".
 
 To use non-string keys or string keys with ``.`` and ``-``, provide a dictionary as a positional argument:
 
@@ -59,13 +59,14 @@ To use non-string keys or string keys with ``.`` and ``-``, provide a dictionary
    })
 
 .. seealso::
-   :ref:`selector-provider` to inject selected provider based on a configuration value or other callable.
+   :ref:`selector-provider` to make injections based on a configuration value, environment variable, or a result of a callable.
 
    ``Aggregate`` provider is different from the :ref:`selector-provider`. ``Aggregate`` provider doesn't select which provider
-   to inject and doesn't have a selector. It is always injected "as is". The rest of the interface of both providers is similar.
+   to inject and doesn't have a selector. It is a group of providers and is always injected "as is". The rest of the interface
+   of both providers is similar.
 
 .. note::
    ``Aggregate`` provider is a successor of :ref:`factory-aggregate-provider` provider. ``Aggregate`` provider doesn't have
-   a restriction on the provider type, while ``FactoryAggregate`` can aggregate only ``Factory`` providers.
+   a restriction on the provider type, while ``FactoryAggregate`` aggregates only ``Factory`` providers.
 
 .. disqus::

docs/providers/selector.rst

@@ -31,6 +31,6 @@ the provider with a matching name. The ``selector`` callable works as a switch:
 value is changed the ``Selector`` provider will delegate the work to another provider.
 
 .. seealso::
-   :ref:`aggregate-provider` to work with a group of providers.
+   :ref:`aggregate-provider` to inject a group of providers.
 
 .. disqus::