Set head panel title of help section.

app/controllers/help_controller.rb

 class HelpController < ApplicationController
+  before_action :set_title
+
   def index
   end
@@ -44,6 +46,11 @@ class HelpController < ApplicationController
   private
+  def set_title
+    @title      = "Help"
+    @title_url  = help_path
+  end
+
   def path_params
     params.require(:category)
     params.require(:file)

app/views/help/index.html.haml

-- page_title "Help"
 %div
   %h1
     GitLab

app/views/help/show.html.haml

-- page_title @file.humanize, *@category.split("/").reverse.map(&:humanize), "Help"
+- page_title @file.humanize, *@category.split("/").reverse.map(&:humanize)
 .documentation.wiki
   = markdown @markdown.gsub('$your_email', current_user.email)