Reword module installation info
Reword module installation info

To address concerns on https://github.com/perl6/doc/pull/2253
dmaestro/doc,jonathanstowe/doc,stmuk/doc,jonathanstowe/doc,MasterDuke17/doc,tbrowder/doc,tbrowder/doc,perl6/doc,stmuk/doc,perl6/doc,jonathanstowe/doc,tbrowder/doc,dmaestro/doc,dmaestro/doc,dmaestro/doc,perl6/doc,MasterDuke17/doc,stmuk/doc,perl6/doc,stmuk/doc,MasterDuke17/doc,stmuk/doc,tbrowder/doc,MasterDuke17/doc,dmaestro/doc,perl6/doc,jonathanstowe/doc,jonathanstowe/doc