Put underline for actions title in docs

docs/layers/actions.md

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 This layer is responsible for implementing actions for entities. [Actions](http://redux.js.org/docs/basics/Actions.html) are payloads of information that send data from your application to your store. They are the only source of information for the store.
 
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 ## authorizeActions.jsx
 
 We provide some actions to authorize a user. The authorize actions include singup, login, logout and update password for a user.