Improve wording in abuse report form

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

app/controllers/abuse_reports_controller.rb

@@ -9,7 +9,8 @@ def create
     @abuse_report.reporter = current_user
     if @abuse_report.save
-      redirect_to root_path, notice: 'Thank you for report. GitLab administrator will be able to see it'
+      message = "Thank you for your report. A GitLab administrator will look into it shortly."
+      redirect_to root_path, notice: message
     else
       render :new
     end

app/views/abuse_reports/new.html.haml

 - page_title "Report abuse"
 %h3.page-title Report abuse
-%p Please use this form if user makes spam or inappropriate content
+%p Please use this form to report users who create spam issues or comments or who otherwise behave inappropriately.
 %hr
 = form_for @abuse_report, html: { class: 'form-horizontal'} do |f|
   = f.hidden_field :user_id
@@ -18,9 +18,7 @@
     .col-sm-10
       = f.text_area :message, class: "form-control", rows: 2, required: true
       .help-block
-        Explain the problem with this account.
-        %br
-        If user sends spam please provide a link to spam issue or comment
+        Explain the problem with this user. If appropriate, provide a link to the relevant issue or comment.
   .form-actions
     = f.submit "Send report", class: "btn btn-create"