Update improve issue boards links to docs [ci skip]

doc/user/project/issue_board.md

@@ -27,7 +27,7 @@ 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](#multiple-issue-boards), available
+With [Multiple Issue Boards](#use-cases-for-multiple-issue-boards), available
 only in [GitLab Enterprise Edition](#features-per-tier),
 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,
@@ -75,7 +75,7 @@ each team can have their own board to organize their workflow individually.
 
 #### Scrum team
 
-With multiple Issue Boards, each team has one board. Now you can move issues through each
+With Multiple Issue Boards, each team has one board. Now you can move issues through each
 part of the process. For instance: **To Do**, **Doing**, and **Done**.
 
 #### Organization of topics

ee/app/views/shared/promotions/_promote_issue_board.html.haml

@@ -14,10 +14,10 @@
         = link_to _('Multiple issue boards'), help_page_path('user/project/issue_board.html', anchor:'use-cases-for-multiple-issue-boards'), target: '_blank'
     - unless @project.feature_available?(:scoped_issue_board)
       %li
-        = link_to _('Scoped issue boards'), help_page_path('user/project/issue_board.html', anchor:'board-with-a-milestone'), target: '_blank'
+        = link_to _('Scoped issue boards'), help_page_path('user/project/issue_board.html', anchor:'configurable-issue-boards-starter'), target: '_blank'
     - unless @project.feature_available?(:issue_board_focus_mode)
       %li
-        = link_to _('Issue board focus mode'), help_page_path('user/project/issue_board.html', anchor:'focus-mode'), target: '_blank'
+        = link_to _('Issue board focus mode'), help_page_path('user/project/issue_board.html', anchor:'focus-mode-starter'), target: '_blank'
   = render 'shared/promotions/promotion_link_project'
   .top-space
     %button.btn.btn-default.btn-block#hide-btn{ :href => "#", "@click.stop" => "clearPromotionState" }