Update src/networkapi.jl

Co-authored-by: Sam Isaacson <[email protected]>

Author: TorkelE

src/networkapi.jl

@@ -1500,7 +1500,7 @@ integer id of the parameter within the system.
 - `disablechecks` will disable checking for whether the passed in variable is
   already defined, which is useful when adding many new variables to the system.
   *Do not disable checks* unless you are sure the passed in variable is a new
-  variable, as this will potentially leave the system in an undefined unknown.
+  variable, as this will potentially leave the system in an undefined state.
 """
 function addparam!(network::ReactionSystem, p::Num; disablechecks = false)
     addparam!(network, value(p); disablechecks = disablechecks)