Fix typos

Author: bf4

docs/howto/serialize_poro.md

@@ -29,7 +29,7 @@ define and validate which methods ActiveModelSerializers expects to be implement
 
 An implementation of the complete spec is included either for use or as reference:
 [`ActiveModelSerializers::Model`](../../lib/active_model_serializers/model.rb).
-You can use in production code that will make your PORO a lot cleaner.  
+You can use in production code that will make your PORO a lot cleaner.
 
 The above code now becomes:
 

test/action_controller/namespace_lookup_test.rb

@@ -86,15 +86,15 @@ def explicit_namespace_as_string
               book = Book.new(title: 'New Post', body: 'Body')
 
               # because this is a string, ruby can't auto-lookup the constant, so otherwise
-              # the looku things we mean ::Api::V2
+              # the lookup thinks we mean ::Api::V2
               render json: book, namespace: 'ActionController::Serialization::NamespaceLookupTest::Api::V2'
             end
 
             def explicit_namespace_as_symbol
               book = Book.new(title: 'New Post', body: 'Body')
 
               # because this is a string, ruby can't auto-lookup the constant, so otherwise
-              # the looku things we mean ::Api::V2
+              # the lookup thinks we mean ::Api::V2
               render json: book, namespace: :'ActionController::Serialization::NamespaceLookupTest::Api::V2'
             end