Adding the case for nested state objects (reduxjs#2014)

* Adding the case for nested state objects Immutability helpers are mentioned elsewhere in the docs but I thought a reference here would be nice as I myself couldn't find the reason for my issues by looking at the troubleshooting page * correcting spelling * Fix wording and linkage.
jackrole · Oct 5, 2016 · 055f005 · 055f005
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diff --git a/docs/Troubleshooting.md b/docs/Troubleshooting.md
@@ -119,6 +119,8 @@ return state.map((todo, index) => {
 
 Note that experimental language features are subject to change.
 
+Also keep an eye out for nested state objects that need to be deeply copied. Both `_.extend` and `Object.assign` make a shallow copy of the state. See [Updating Nested Objects](/docs/recipes/reducers/ImmutableUpdatePatterns.md#updating-nested-objects) for suggestions on how to deal with nested state objects.
+
 #### Don't forget to call [`dispatch(action)`](api/Store.md#dispatch)
 
 If you define an action creator, calling it will *not* automatically dispatch the action. For example, this code will do nothing: