Merge branch 'docs/overview-features-2' into 'master'

Add overview and use-cases to Issue Boards doc

See merge request !12543

doc/user/project/issue_board.md

-# Issue board
->**Notes:**
-- [Introduced][ce-5554] in GitLab 8.11.
-- The Backlog column was replaced by the **Add issues** button in GitLab 8.17.
+# Issue Board
+>**Note:**
+[Introduced][ce-5554] in [GitLab 8.11](https://about.gitlab.com/2016/08/22/gitlab-8-11-released/#issue-board).
 The GitLab Issue Board is a software project management tool used to plan,
 organize, and visualize a workflow for a feature or product release.
@@ -15,12 +14,65 @@ Other interesting links:
 ## Overview
-The Issue Board builds on GitLab's existing issue tracking functionality and
+The Issue Board builds on GitLab's existing
+[issue tracking functionality](issues/index.md#issue-tracker) and
 leverages the power of [labels] by utilizing them as lists of the scrum board.
-With the Issue Board you can have a different view of your issues while also
+With the Issue Board you can have a different view of your issues while
 maintaining the same filtering and sorting abilities you see across the
-issue tracker.
+issue tracker. An Issue Board is based on its project's label structure, therefore, it
+applies the same descriptive labels to indicate placement on the board, keeping
+consistency throughout the entire development lifecycle.
+
+An Issue Board shows you what issues your team is working on, who is assigned to each,
+and where in the workflow those issues are.
+
+You create issues, host code, perform reviews, build, test,
+and deploy from one single platform. Issue Boards help you to visualize
+and manage the entire process _in_ GitLab.
+
+With [Multiple Issue Boards](https://docs.gitlab.com/ee/user/project/issue_board.html#multiple-issue-boards), available
+only in [GitLab Enterprise Edition](https://about.gitlab.com/gitlab-ee/),
+you go even further, as you can not only keep yourself and your project
+organized from a broader perspective with one Issue Board per project,
+but also allow your team members to organize their own workflow by creating
+multiple Issue Boards within the same project.
+
+## Use cases
+
+GitLab Workflow allows you to discuss proposals in issues, categorize them
+with labels, and from there organize and prioritize them with Issue Boards.
+
+For example, let's consider this simplified development workflow:
+
+1. You have a repository hosting your app's codebase
+and your team actively contributing to code
+1. Your **backend** team starts working a new
+implementation, gathers feedback and approval, and pass it over to **frontend**
+1. When frontend is complete, the new feature is deployed to **staging** to be tested
+1. When successful, it is deployed to **production**
+
+If we have the labels "**backend**", "**frontend**", "**staging**", and
+"**production**", and an Issue Board with a list for each, we can:
+
+- Visualize the entire flow of implementations since the
+beginning of the development lifecycle until deployed to production
+- Prioritize the issues in a list by moving them vertically
+- Move issues between lists to organize them according to the labels you've set
+- Add multiple issues to lists in the board by selecting one or more existing issues
+
+![issue card moving](img/issue_board_move_issue_card_list.png)
+
+> **Notes:**
+>
+>- For a broader use case, please check the blog post
+[GitLab Workflow, an Overview](https://about.gitlab.com/2016/10/25/gitlab-workflow-an-overview/#gitlab-workflow-use-case-scenario).
+>
+>- For a real use case, please check why
+[Codepen decided to adopt Issue Boards](https://about.gitlab.com/2017/01/27/codepen-welcome-to-gitlab/#project-management-everything-in-one-place)
+to improve their workflow with [multiple boards](https://docs.gitlab.com/ee/user/project/issue_board.html#multiple-issue-boards).
+
+## Issue Board terminology
 Below is a table of the definitions used for GitLab's Issue Board.
@@ -57,7 +109,7 @@ In short, here's a list of actions you can take in an Issue Board:
 If you are not able to perform one or more of the things above, make sure you
 have the right [permissions](#permissions).
-## First time using the issue board
+## First time using the Issue Board
 The first time you navigate to your Issue Board, you will be presented with
 a default list (**Done**) and a welcoming message that gives
@@ -98,7 +150,7 @@ list view that is removed. You can always add it back later if you need.
 ## Adding issues to a list
 You can add issues to a list by clicking the **Add issues** button that is
-present in the upper right corner of the issue board. This will open up a modal
+present in the upper right corner of the Issue Board. This will open up a modal
 window where you can see all the issues that do not belong to any list.
 Select one or more issues by clicking on the cards and then click **Add issues**

doc/user/project/issues/index.md

-# Issues documentation
+# Issues
 The GitLab Issue Tracker is an advanced and complete tool
 for tracking the evolution of a new idea or the process