Remove Resource\ResourceInterface from docs

refs #31

Author: Art4

docs/objects-resource-collection.md

@@ -3,7 +3,7 @@
 
 ## Description
 
-The `Resource\Collection` represents [an array of resource objects, an array of resource identifier objects, or an empty array, for requests that target resource collections](http://jsonapi.org/format/#document-top-level). It implements the `Resource\ResourceInterface`.
+The `Resource\Collection` represents [an array of resource objects, an array of resource identifier objects, or an empty array, for requests that target resource collections](http://jsonapi.org/format/#document-top-level).
 
 Property of:
 - [Document object](objects-document.md)

docs/objects-resource-identifier-collection.md

@@ -3,7 +3,7 @@
 
 ## Description
 
-The `Resource\IdentifierCollection` is a [Resource Collection object](objects-resource-collection.md) that is either empty or holds only [Resource Identifier object](objects-resource-identifier.md)s. It implements the `Resource\ResourceInterface`.
+The `Resource\IdentifierCollection` is a [Resource Collection object](objects-resource-collection.md) that is either empty or holds only [Resource Identifier object](objects-resource-identifier.md)s.
 
 Property of:
 - [Relationship object](objects-relationship.md)

docs/objects-resource-identifier.md

@@ -3,7 +3,7 @@
 
 ## Description
 
-The `Resource\Identifier` represents a [resource identifier object](http://jsonapi.org/format/#document-resource-identifier-objects). It implements the `Resource\ResourceInterface`.
+The `Resource\Identifier` represents a [resource identifier object](http://jsonapi.org/format/#document-resource-identifier-objects).
 
 Property of:
 - [Document object](objects-document.md)

docs/objects-resource-item.md

@@ -3,7 +3,7 @@
 
 ## Description
 
-The `Resource\Item` represents a [resource object](http://jsonapi.org/format/#document-resource-objects). It implements the `Resource\ResourceInterface`.
+The `Resource\Item` represents a [resource object](http://jsonapi.org/format/#document-resource-objects).
 
 Property of:
 - [Document object](objects-document.md)

docs/objects-resource-nullresource.md

@@ -3,7 +3,7 @@
 
 ## Description
 
-The `Resource\NullResource` represents a [`null` inside the top level data](http://jsonapi.org/format/#document-top-level). It implements the `Resource\ResourceInterface`.
+The `Resource\NullResource` represents a [`null` inside the top level data](http://jsonapi.org/format/#document-top-level).
 
 Property of:
 - [Document object](objects-document.md)