doc: clarify what a package is slightly
doc: clarify what a package is slightly

Credit: da39a3ee5e6b4b0d3255bfef95601890afd80709@aredridel
Reviewed-By: da39a3ee5e6b4b0d3255bfef95601890afd80709@othiym23
PR-URL: https://github.com/npm/npm/pull/10497

evanlucas/npm,midniteio/npm,TimeToogo/npm,yibn2008/npm,kimshinelove/naver-npm,Volune/npm,xalopp/npm,rsp/npm,kemitchell/npm,evanlucas/npm,yibn2008/npm,kemitchell/npm,xalopp/npm,cchamberlain/npm-msys2,DaveEmmerson/npm,rsp/npm,yodeyer/npm,lxe/npm,cchamberlain/npm,evanlucas/npm,princeofdarkness76/npm,chadnickbok/npm,ekmartin/npm,TimeToogo/npm,midniteio/npm,chadnickbok/npm,segrey/npm,DIREKTSPEED-LTD/npm,kimshinelove/naver-npm,yodeyer/npm,yibn2008/npm,segrey/npm,ekmartin/npm,Volune/npm,cchamberlain/npm,TimeToogo/npm,lxe/npm,kemitchell/npm,misterbyrne/npm,misterbyrne/npm,princeofdarkness76/npm,cchamberlain/npm-msys2,cchamberlain/npm,ekmartin/npm,DIREKTSPEED-LTD/npm,xalopp/npm,Volune/npm,evocateur/npm,evocateur/npm,DaveEmmerson/npm,rsp/npm,DIREKTSPEED-LTD/npm,misterbyrne/npm,yodeyer/npm,princeofdarkness76/npm,DaveEmmerson/npm,kimshinelove/naver-npm,lxe/npm,evocateur/npm,midniteio/npm,cchamberlain/npm-msys2,segrey/npm,chadnickbok/npm