Improve docs to troubleshoot context errors (#1827)

Author: vivek1729

docs/troubleshooting.md

@@ -25,8 +25,9 @@ In short,
 If you have context issues,
 
 1. [Make sure you don’t have a duplicate instance of React](https://medium.com/@dan_abramov/two-weird-tricks-that-fix-react-7cf9bbdef375) on the page.
-2. Make sure you didn’t forget to wrap your root or some other ancestor component in [`<Provider>`](#provider-store).
-3. Make sure you’re running the latest versions of React and React Redux.
+2. Make sure you don't have multiple instances/copies of React Redux in your project.
+3. Make sure you didn’t forget to wrap your root or some other ancestor component in [`<Provider>`](#provider-store).
+4. Make sure you’re running the latest versions of React and React Redux.
 
 ### Invariant Violation: addComponentAsRefTo(...): Only a ReactOwner can have refs. This usually means that you’re trying to add a ref to a component that doesn’t have an owner