Minor revisions to Mattermost integration page

Revise text that I'm comfortable changing around. This page is
formatted differently than I'm used to, and it needs far more work
than what I've done here to make it good, but I can at least reunite
all the help steps together and bring them closer to GitLab style.

app/models/project_services/mattermost_slash_commands_service.rb

@@ -14,7 +14,7 @@ class MattermostSlashCommandsService < SlashCommandsService
   end
 
   def description
-    "Perform common operations in Mattermost"
+    "Perform common tasks with slash commands."
   end
 
   def self.to_param

app/views/projects/services/mattermost_slash_commands/_detailed_help.html.haml

 - pretty_name = @project&.full_name ? html_escape(@project&.full_name) : '<' + _('project name') + '>'
 - run_actions_text = html_escape(s_("ProjectService|Perform common operations on GitLab project: %{project_name}")) % { project_name: pretty_name }
 
-%p= s_("ProjectService|To set up this service:")
+%p= s_("ProjectService|To configure this integration, you should:")
 %ul.list-unstyled.indent-list
   %li
     1.
-    = link_to 'https://docs.mattermost.com/developer/slash-commands.html#enabling-custom-commands', target: '_blank', rel: 'noopener noreferrer nofollow' do
+    = link_to 'https://docs.gitlab.com/ee/user/project/integrations/mattermost_slash_commands.html#enable-custom-slash-commands', target: '_blank', rel: 'noopener noreferrer nofollow' do
       Enable custom slash commands
       = sprite_icon('external-link')
-    on your Mattermost installation
+    on your Mattermost installation.
   %li
     2.
-    = link_to 'https://docs.mattermost.com/developer/slash-commands.html#set-up-a-custom-command', target: '_blank', rel: 'noopener noreferrer nofollow' do
+    = link_to 'https://docs.gitlab.com/ee/user/project/integrations/mattermost_slash_commands.html#create-a-slash-command', target: '_blank', rel: 'noopener noreferrer nofollow' do
       Add a slash command
       = sprite_icon('external-link')
-    in your Mattermost team with these options:
+    in your Mattermost team with the options listed below.
+  %li
+    3. Paste the token into the
+    %strong Token
+    field.
+  %li
+    4. Select the
+    %strong Active
+    check box, then select
+    %strong Save changes
+    to start using GitLab inside Mattermost!
+
 %hr
 
 .help-form
@@ -85,17 +96,3 @@
       = text_field_tag :autocomplete_description, run_actions_text, class: 'form-control form-control-sm', readonly: 'readonly'
       .input-group-append
         = clipboard_button(target: '#autocomplete_description', class: 'input-group-text')
-
-%hr
-
-%ul.list-unstyled.indent-list
-  %li
-    3. Paste the
-    %strong Token
-    into the field below
-  %li
-    4. Select the
-    %strong Active
-    checkbox, press
-    %strong Save changes
-    and start using GitLab inside Mattermost!

app/views/projects/services/mattermost_slash_commands/_help.html.haml

@@ -3,12 +3,12 @@
 .info-well
   .well-segment
     %p
-      = s_("MattermostService|This service allows users to perform common operations on this project by entering slash commands in Mattermost.")
+      = s_("MattermostService|Use this service to perform common tasks in your project by entering slash commands in Mattermost.")
       = link_to help_page_path('user/project/integrations/mattermost_slash_commands.md'), target: '_blank' do
-        = _("View documentation")
+        = _("How do I configure this integration?")
         = sprite_icon('external-link')
     %p.inline
-      = s_("MattermostService|See list of available commands in Mattermost after setting up this service, by entering")
+      = s_("MattermostService|After you configure the integration, view your new Mattermost commands by entering")
     %kbd.inline /<trigger> help
     - if !enabled && @service.project_level?
       = render 'projects/services/mattermost_slash_commands/detailed_help', subject: @service

locale/gitlab.pot

@@ -15531,6 +15531,9 @@ msgstr ""
 msgid "How do I configure runners?"
 msgstr ""
 
+msgid "How do I configure this integration?"
+msgstr ""
+
 msgid "How do I generate it?"
 msgstr ""
 
@@ -18882,6 +18885,9 @@ msgstr ""
 msgid "MattermostService|Add to Mattermost"
 msgstr ""
 
+msgid "MattermostService|After you configure the integration, view your new Mattermost commands by entering"
+msgstr ""
+
 msgid "MattermostService|Command trigger word"
 msgstr ""
 
@@ -18900,13 +18906,10 @@ msgstr ""
 msgid "MattermostService|Response username"
 msgstr ""
 
-msgid "MattermostService|See list of available commands in Mattermost after setting up this service, by entering"
-msgstr ""
-
 msgid "MattermostService|Suggestions:"
 msgstr ""
 
-msgid "MattermostService|This service allows users to perform common operations on this project by entering slash commands in Mattermost."
+msgid "MattermostService|Use this service to perform common tasks in your project by entering slash commands in Mattermost."
 msgstr ""
 
 msgid "Max 100,000 events"
@@ -24086,7 +24089,7 @@ msgstr ""
 msgid "ProjectService|TeamCity URL"
 msgstr ""
 
-msgid "ProjectService|To set up this service:"
+msgid "ProjectService|To configure this integration, you should:"
 msgstr ""
 
 msgid "ProjectSettings|%{link_start}What are description templates?%{link_end}"

spec/features/projects/services/user_activates_mattermost_slash_command_spec.rb

@@ -15,7 +15,7 @@ RSpec.describe 'Set up Mattermost slash commands', :js do
       let(:mattermost_enabled) { true }
 
       it 'shows a help message' do
-        expect(page).to have_content("This service allows users to perform common")
+        expect(page).to have_content("Use this service to perform common")
       end
 
       it 'shows a token placeholder' do