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

Changed formatting
akrabat/zf2-documentation,gennadiylitvinyuk/zf2-documentation,rettal/zf2-documentation,rettal/zf2-documentation,gennadiylitvinyuk/zf2-documentation,Rud5G/zf2-documentation,samsonasik/zf2-documentation,Rud5G/zf2-documentation,akrabat/zf2-documentation,samsonasik/zf2-documentation