doc: Clarify that default install ver is latest
doc: Clarify that default install ver is latest

That is, that `npm install foo` ≡
`npm install foo@latest` by default

PR-URL: https://github.com/npm/npm/pull/10790
Credit: da39a3ee5e6b4b0d3255bfef95601890afd80709@cvrebert

rsp/npm,evocateur/npm,chadnickbok/npm,evocateur/npm,DIREKTSPEED-LTD/npm,misterbyrne/npm,xalopp/npm,DaveEmmerson/npm,DIREKTSPEED-LTD/npm,lxe/npm,Volune/npm,kimshinelove/naver-npm,yibn2008/npm,midniteio/npm,chadnickbok/npm,yibn2008/npm,TimeToogo/npm,cchamberlain/npm,kemitchell/npm,lxe/npm,yodeyer/npm,cchamberlain/npm,midniteio/npm,Volune/npm,DaveEmmerson/npm,TimeToogo/npm,DIREKTSPEED-LTD/npm,kemitchell/npm,xalopp/npm,DaveEmmerson/npm,rsp/npm,kimshinelove/naver-npm,Volune/npm,segrey/npm,lxe/npm,evanlucas/npm,yodeyer/npm,chadnickbok/npm,misterbyrne/npm,kimshinelove/naver-npm,xalopp/npm,rsp/npm,cchamberlain/npm-msys2,yibn2008/npm,misterbyrne/npm,cchamberlain/npm,midniteio/npm,evocateur/npm,yodeyer/npm,kemitchell/npm,cchamberlain/npm-msys2,TimeToogo/npm,segrey/npm,evanlucas/npm,cchamberlain/npm-msys2,evanlucas/npm,segrey/npm