add missing comment

Author: jd-lara

src/models/supplemental_accessors.jl

@@ -17,9 +17,11 @@ Calculate the admittance of AC branches
 get_series_susceptance(b::ACBranch) = 1 / get_x(b)
 
 """
-Returns the series susceptance of a controllable transformer following the convention
+
 in power systems to define susceptance as the inverse of the imaginary part of the impedance.
 In the case of phase shifter transformers the angle is ignored.
+
+See also: [`get_series_susceptances`](@ref) for 3-winding transformers
 """
 function get_series_susceptance(b::Union{TapTransformer, PhaseShiftingTransformer})
     y = 1 / get_x(b)