Update docs/languages/en/index.rst
Update docs/languages/en/index.rst

This is to correspond with https://github.com/zendframework/zf2-documentation/commit/6c002f3010046f40ca81540bc34070e55f891c2f
samsonasik/zf2-documentation,Rud5G/zf2-documentation,gennadiylitvinyuk/zf2-documentation,samsonasik/zf2-documentation,Rud5G/zf2-documentation,akrabat/zf2-documentation,rettal/zf2-documentation,akrabat/zf2-documentation,rettal/zf2-documentation,gennadiylitvinyuk/zf2-documentation