Remove useless text tips on commonly used pages

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/dashboard/issues.html.haml

@@ -16,8 +16,5 @@
 
   = render 'shared/issuable/filter', type: :issues
 
-.gray-content-block.second-block
-  List all issues from all projects you have access to.
-
 .prepend-top-default
   = render 'shared/issues'

app/views/dashboard/merge_requests.html.haml

@@ -7,8 +7,5 @@
 
   = render 'shared/issuable/filter', type: :merge_requests
 
-.gray-content-block.second-block
-  List all merge requests from all projects you have access to.
-
 .prepend-top-default
   = render 'shared/merge_requests'

app/views/dashboard/milestones/index.html.haml

@@ -7,9 +7,6 @@
 
   = render 'shared/milestones_filter'
 
-.gray-content-block
-  List all milestones from all projects you have access to.
-
 .milestones
   %ul.content-list
     - if @milestones.blank?

app/views/projects/milestones/index.html.haml

@@ -11,9 +11,6 @@
 
   = render 'shared/milestones_filter'
 
-.gray-content-block
-  Milestone allows you to group issues and set due date for it
-
 .milestones
   %ul.content-list
     = render @milestones