Merge pull request #471 from isaacsas/fix-doc-typo

fix typo in doc

Author: ChrisRackauckas

src/systems/jumps/jumpsystem.jl

@@ -130,8 +130,8 @@ function DiffEqBase.DiscreteProblem(sys::JumpSystem, u0map, tspan,
                                     parammap=DiffEqBase.NullParameters; kwargs...)
 ```
 
-Generates a black DiscreteProblem for a JumpSystem to utilize as its
-solving `prob.prob`. This is used in the case where there are no ODEs
+Generates a blank DiscreteProblem for a pure jump JumpSystem to utilize as 
+its `prob.prob`. This is used in the case where there are no ODEs
 and no SDEs associated with the system.
 
 Continuing the example from the [`JumpSystem`](@ref) definition: