doc: Clarify homepage url documentation
doc: Clarify homepage url documentation

Credit: da39a3ee5e6b4b0d3255bfef95601890afd80709@stevemao
PR-URL: https://github.com/npm/npm/pull/11461
Reviewed-By: da39a3ee5e6b4b0d3255bfef95601890afd80709@iarna

evocateur/npm,DaveEmmerson/npm,DaveEmmerson/npm,midniteio/npm,TimeToogo/npm,midniteio/npm,misterbyrne/npm,lxe/npm,TimeToogo/npm,misterbyrne/npm,chadnickbok/npm,misterbyrne/npm,TimeToogo/npm,Volune/npm,DaveEmmerson/npm,midniteio/npm,Volune/npm,chadnickbok/npm,chadnickbok/npm,lxe/npm,lxe/npm,evocateur/npm,evocateur/npm,Volune/npm