aliasing_API docstring for diffeqbase

Author: jClugstor

src/solve.jl

@@ -946,8 +946,12 @@ explanations of the timestepping algorithms, see the
   Note that this is only required if the algorithm doesn't have
   a free or lazy interpolation (`DP8()`). If `calck = false`, `saveat` cannot be used.
   The rare keyword `calck` can be useful in event handling.
-* `alias_u0`: allows the solver to alias the initial condition array that is contained
-  in the problem struct. Defaults to false.
+* `alias`: an `AbstractAliasSpecifier` object that holds fields specifying which variables to alias
+  when solving. For example, to tell an ODE solver to alias the `u0` array, you can use an `ODEAliases` object, 
+  and the `alias_u0` keyword argument, e.g. `solve(prob,alias = ODEAliases(alias_u0 = true))`. 
+  For more information on what can be aliased for each problem type, see the documentation for the `AbstractAliasSpecifier`
+  associated with that problem type. Set to `true` to alias every variable possible, or to `false` to disable aliasing.
+  Defaults to an `AbstractAliasSpecifier` instance with `nothing` for all fields, which tells the solver to use the default behavior.
 
 ### Miscellaneous