Update docs/languages/en/user-guide/modules.rst
Update docs/languages/en/user-guide/modules.rst

According to https://github.com/zendframework/zf2-documentation/pull/216#issuecomment-8202575 the <?php start tag should be ommited.
akrabat/zf2-documentation,rettal/zf2-documentation,samsonasik/zf2-documentation,Rud5G/zf2-documentation,Rud5G/zf2-documentation,gennadiylitvinyuk/zf2-documentation,gennadiylitvinyuk/zf2-documentation,rettal/zf2-documentation,akrabat/zf2-documentation,samsonasik/zf2-documentation