Update src/dcp.jl

Author: odow

src/dcp.jl

@@ -15,6 +15,8 @@
 # http://web.stanford.edu/~boyd/papers/disc_cvx_prog.html
 #############################################################################
 
+# This is a subtype of MOI.UnsupportedError so that non-DCP
+# errors trigger the correct paths in MOI.Test for Convex.Optimizer.
 struct DCPViolationError <: MOI.UnsupportedError end
 
 function Base.showerror(io::IO, ::DCPViolationError)