DOC: changed a bit the githooks installer
DOC: changed a bit the githooks installer

Former-commit-id: f07d94971d25616a48548ddce806689bbebcbd82
Former-commit-id: 292974b0687751549c12699b57335407c30fe594
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox