Changing cookbook/ deployment  info

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets |  

Added  info  in cookbook in  deployment  about  checking  server requirements  php app/check.php
this is probably because the submodule was not updated locally to match the version used in master, and ``git add .`` was used when resolving conflicts during the rebase, adding the submodule target change to the diff