add removal notes

src/optimise/train.jl

@@ -38,6 +38,9 @@ struct SkipException <: Exception end
 Call `Flux.skip()` in a callback to indicate when a callback condition is met.
 This will trigger the train loop to skip the current data point and not update with the calculated gradient.
 
+!!! note
+    `Flux.skip()` will be removed from Flux 0.14
+
 # Examples
 ```julia
 cb = function ()
@@ -61,6 +64,9 @@ struct StopException <: Exception end
 Call `Flux.stop()` in a callback to indicate when a callback condition is met.
 This will trigger the train loop to stop and exit.
 
+!!! note
+    `Flux.stop()` will be removed from Flux 0.14. It should be replaced with `break` in an ordinary `for` loop.
+
 # Examples
 ```julia
 cb = function ()
@@ -145,6 +151,9 @@ end
 Run `body` `N` times. Mainly useful for quickly doing multiple epochs of
 training in a REPL.
 
+!!! note
+    The macro `@epochs` will be removed from Flux 0.14. Please just write an ordinary `for` loop.
+
 # Examples
 ```julia
 julia> Flux.@epochs 2 println("hello")