[io grant] Remove entirely-invented "File test operators"
[io grant] Remove entirely-invented "File test operators"

Remind people of Pair.ACCEPTS from file test method docs, which
is what these "operators" really are.

gfldex/doc,jonathanstowe/doc,stmuk/doc,dmaestro/doc,perl6/doc,jonathanstowe/doc,dmaestro/doc,jonathanstowe/doc,antquinonez/doc,perl6/doc,MasterDuke17/doc,MasterDuke17/doc,tbrowder/doc,jonathanstowe/doc,MasterDuke17/doc,perl6/doc,antquinonez/doc,tbrowder/doc,dmaestro/doc,stmuk/doc,stmuk/doc,stmuk/doc,perl6/doc,gfldex/doc,perl6/doc,antquinonez/doc,tbrowder/doc,stmuk/doc,gfldex/doc,MasterDuke17/doc,antquinonez/doc,dmaestro/doc,dmaestro/doc,gfldex/doc,tbrowder/doc,jonathanstowe/doc,antquinonez/doc,gfldex/doc