Aqueous dispersion of resorcinol formaldehyde latex, method for the manufacture of aqueous dispersions of resorcinol formaldehyde latex formulation, adhesion promoters, method for improving the adhesion of reinforcing fibers to the cross-linked rubber and / or elastomers, fibers with adhesion improves The use of aqueous dispersions of resorcinol formaldehyde latex and use of the formulation of adhesion promoters