fix(docs): fix broken links in FAQ toc (#3159)

Author: xphong

docs/FAQ.md

@@ -19,16 +19,16 @@
   - [Is it OK to have more than one middleware chain in my store enhancer? What is the difference between next and dispatch in a middleware function?](/docs/faq/StoreSetup.md#is-it-ok-to-have-more-than-one-middleware-chain-in-my-store-enhancer-what-is-the-difference-between-next-and-dispatch-in-a-middleware-function)
   - [How do I subscribe to only a portion of the state? Can I get the dispatched action as part of the subscription?](/docs/faq/StoreSetup.md#how-do-i-subscribe-to-only-a-portion-of-the-state-can-i-get-the-dispatched-action-as-part-of-the-subscription)
 - **Actions**
-  - [Why should type be a string, or at least serializable? Why should my action types be constants?](/docs/Actions.md#why-should-type-be-a-string-or-at-least-serializable-why-should-my-action-types-be-constants)
-  - [Is there always a one-to-one mapping between reducers and actions?](/docs/Actions.md#is-there-always-a-one-to-one-mapping-between-reducers-and-actions)
-  - [How can I represent “side effects” such as AJAX calls? Why do we need things like “action creators”, “thunks”, and “middleware” to do async behavior?](/docs/Actions.md#how-can-i-represent-side-effects-such-as-ajax-calls-why-do-we-need-things-like-action-creators-thunks-and-middleware-to-do-async-behavior)
-  - [What async middleware should I use? How do you decide between thunks, sagas, observables, or something else?](/docs/Actions.md#what-async-middleware-should-i-use-how-do-you-decide-between-thunks-sagas-observables-or-something-else)
-  - [Should I dispatch multiple actions in a row from one action creator?](/docs/Actions.md#should-i-dispatch-multiple-actions-in-a-row-from-one-action-creator)
+  - [Why should type be a string, or at least serializable? Why should my action types be constants?](/docs/faq/Actions.md#why-should-type-be-a-string-or-at-least-serializable-why-should-my-action-types-be-constants)
+  - [Is there always a one-to-one mapping between reducers and actions?](/docs/faq/Actions.md#is-there-always-a-one-to-one-mapping-between-reducers-and-actions)
+  - [How can I represent “side effects” such as AJAX calls? Why do we need things like “action creators”, “thunks”, and “middleware” to do async behavior?](/docs/faq/Actions.md#how-can-i-represent-side-effects-such-as-ajax-calls-why-do-we-need-things-like-action-creators-thunks-and-middleware-to-do-async-behavior)
+  - [What async middleware should I use? How do you decide between thunks, sagas, observables, or something else?](/docs/faq/Actions.md#what-async-middleware-should-i-use-how-do-you-decide-between-thunks-sagas-observables-or-something-else)
+  - [Should I dispatch multiple actions in a row from one action creator?](/docs/faq/Actions.md#should-i-dispatch-multiple-actions-in-a-row-from-one-action-creator)
 - **Immutable Data**
-  - [What are the benefits of immutability?](/docs/ImmutableData.md#what-are-the-benefits-of-immutability)
-  - [Why is immutability required by Redux?](/docs/ImmutableData.md#why-is-immutability-required-by-redux)
-  - [What approaches are there for handling data immutability? Do I have to use Immutable.JS?](/docs/ImmutableData.md#what-approaches-are-there-for-handling-data-immutability-do-i-have-to-use-immutable-js)
-  - [What are the issues with using JavaScript for immutable operations?](/docs/ImmutableData.md#what-are-the-issues-with-using-plain-javascript-for-immutable-operations)
+  - [What are the benefits of immutability?](/docs/faq/ImmutableData.md#what-are-the-benefits-of-immutability)
+  - [Why is immutability required by Redux?](/docs/faq/ImmutableData.md#why-is-immutability-required-by-redux)
+  - [What approaches are there for handling data immutability? Do I have to use Immutable.JS?](/docs/faq/ImmutableData.md#what-approaches-are-there-for-handling-data-immutability-do-i-have-to-use-immutable-js)
+  - [What are the issues with using JavaScript for immutable operations?](/docs/faq/ImmutableData.md#what-are-the-issues-with-using-plain-javascript-for-immutable-operations)
 - **Using Immutable.JS with Redux**
   - [Why should I use an immutable-focused library such as Immutable.JS?](/docs/recipes/UsingImmutableJS.md#why-should-i-use-an-immutable-focused-library-such-as-immutable-js)
   - [Why should I choose Immutable.JS as an immutable library?](/docs/recipes/UsingImmutableJS.md#why-should-i-choose-immutable-js-as-an-immutable-library)