add note on traits and more corrections

Author: cordoval

bundles/seo/seo_aware.rst

@@ -30,6 +30,9 @@ the ``SeoMetadata``::
         }
     }
 
+If you are using PHP5.4+ you may also benefit from using the trait ``SeoAwareTrait``
+to plug these behavior into your model.
+
 Now you can set some SEO data for this ``Page`` using the metadata::
 
     use Acme\SiteBundle\Document\Page;
@@ -220,7 +223,7 @@ object:
             </entity>
         </doctrine-mapping>
 
-You can also choose to put the ``SeoMetadata`` class into a seperate table. To
+You can also choose to put the ``SeoMetadata`` class into a separate table. To
 do this, you have to enable ORM support just like you enabled PHPCR enabled
 above and add a OneToOne or ManyToOne relation between the content entity and
 the ``SeoMetadata`` entity.
@@ -233,15 +236,15 @@ form type can be used in forms to edit the ``SeoMetadata`` object.
 
 .. caution::
 
-    The bundles requires the `BurgovKeyValueFormBundle`_ when using the form
+    The bundle requires the `BurgovKeyValueFormBundle`_ when using the form
     type. Make sure you install and enable it.
 
 Sonata Admin Integration
 ------------------------
 
 Besides providing a form type, the bundle also provides a Sonata Admin
 Extension. This extension adds a field for the ``SeoMetadata`` when an admin
-edits an objec that implements the ``SeoAwareInterface`` in the Sonata Admin
+edits an object that implements the ``SeoAwareInterface`` in the Sonata Admin
 panel.
 
 .. caution::