Update docs/languages/en/ref/installation.rst
Update docs/languages/en/ref/installation.rst

I commented line 7 because I believe right now, it can do more damage than good.
We'll wait until it is updated to zf2.
rettal/zf2-documentation,akrabat/zf2-documentation,gennadiylitvinyuk/zf2-documentation,samsonasik/zf2-documentation,samsonasik/zf2-documentation,Rud5G/zf2-documentation,rettal/zf2-documentation,Rud5G/zf2-documentation,gennadiylitvinyuk/zf2-documentation,akrabat/zf2-documentation