Fix line lenght issues on spec files

spec/shared/models/document_validations.rb

@@ -34,9 +34,10 @@ shared_examples "document validations" do |documentable_factory|
 
   it "is not valid for attachments larger than documentable max_file_size definition" do
     document.stub(:attachment_file_size).and_return(maxfilesize.megabytes + 1.byte)
+    max_size_error_message = "must be in between 0 Bytes and #{maxfilesize} MB"
 
     expect(document).not_to be_valid
-    expect(document.errors[:attachment]).to include "must be in between 0 Bytes and #{maxfilesize} MB"
+    expect(document.errors[:attachment]).to include max_size_error_message
   end
 
   it "is not valid without a user_id" do
@@ -59,4 +60,4 @@ shared_examples "document validations" do |documentable_factory|
     expect(document).not_to be_valid
   end
 
-end
+end