Fixed plugin-feed doc about filtering (#2572)
Fixed plugin-feed doc about filtering (#2572)


fk/gatsby,fk/gatsby,0x80/gatsby,Khaledgarbaya/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,0x80/gatsby,mingaldrichgan/gatsby,mingaldrichgan/gatsby,gatsbyjs/gatsby,0x80/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,fabrictech/gatsby,ChristopherBiscardi/gatsby,danielfarrell/gatsby,fabrictech/gatsby,fk/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,fabrictech/gatsby,mingaldrichgan/gatsby,Khaledgarbaya/gatsby,danielfarrell/gatsby,Khaledgarbaya/gatsby,danielfarrell/gatsby,ChristopherBiscardi/gatsby