Add "or a package name" to NuGet install doc
Add "or a package name" to NuGet install doc

I tested this: while `NugetInstall` does work with a `packages.config`,
it also just works with a package name; in fact, despite the fact that
the documentation calls the parameter `packageFiles`, it is called
`packageName` in the code.

However, I haven't been able to regenerate the documentation yet to
confirm that I understand how the documentation works, because I'm on
Linux. I'll have to try on Windows, unless someone more knowledgeable
can just confirm that this will update the API docs.

molinch/FAKE,dmorgan3405/FAKE,mglodack/FAKE,yonglehou/FAKE,mat-mcloughlin/FAKE,ArturDorochowicz/FAKE,brianary/FAKE,jayp33/FAKE,MiloszKrajewski/FAKE,molinch/FAKE,featuresnap/FAKE,mat-mcloughlin/FAKE,rflechner/FAKE,beeker/FAKE,ilkerde/FAKE,philipcpresley/FAKE,brianary/FAKE,MiloszKrajewski/FAKE,pacificIT/FAKE,mat-mcloughlin/FAKE,wooga/FAKE,dmorgan3405/FAKE,MichalDepta/FAKE,ilkerde/FAKE,brianary/FAKE,naveensrinivasan/FAKE,darrelmiller/FAKE,mglodack/FAKE,yonglehou/FAKE,wooga/FAKE,beeker/FAKE,MichalDepta/FAKE,jayp33/FAKE,rflechner/FAKE,ilkerde/FAKE,yonglehou/FAKE,pacificIT/FAKE,molinch/FAKE,NaseUkolyCZ/FAKE,MiloszKrajewski/FAKE,pmcvtm/FAKE,rflechner/FAKE,Kazark/FAKE,gareth-evans/FAKE,MichalDepta/FAKE,philipcpresley/FAKE,pmcvtm/FAKE,featuresnap/FAKE,dmorgan3405/FAKE,wooga/FAKE,RMCKirby/FAKE,Kazark/FAKE,rflechner/FAKE,RMCKirby/FAKE,darrelmiller/FAKE,brianary/FAKE,featuresnap/FAKE,ilkerde/FAKE,darrelmiller/FAKE,wooga/FAKE,NaseUkolyCZ/FAKE,hitesh97/FAKE,naveensrinivasan/FAKE,NaseUkolyCZ/FAKE,MiloszKrajewski/FAKE,darrelmiller/FAKE,yonglehou/FAKE,mglodack/FAKE,hitesh97/FAKE,pmcvtm/FAKE,jayp33/FAKE,dmorgan3405/FAKE,gareth-evans/FAKE,hitesh97/FAKE,philipcpresley/FAKE,pacificIT/FAKE,ArturDorochowicz/FAKE,gareth-evans/FAKE,naveensrinivasan/FAKE,pmcvtm/FAKE,beeker/FAKE,mat-mcloughlin/FAKE,RMCKirby/FAKE,jayp33/FAKE,pacificIT/FAKE,Kazark/FAKE,beeker/FAKE,naveensrinivasan/FAKE,Kazark/FAKE,MichalDepta/FAKE,featuresnap/FAKE,RMCKirby/FAKE,mglodack/FAKE,philipcpresley/FAKE,NaseUkolyCZ/FAKE,molinch/FAKE,gareth-evans/FAKE,hitesh97/FAKE,ArturDorochowicz/FAKE,ArturDorochowicz/FAKE