Customize the Devise `reset_password_instructions` email

app/views/devise/mailer/reset_password_instructions.html.erb

-<p>Hello <%= @resource.email %>!</p>
-
-<p>Someone has requested a link to change your password, and you can do this through the link below.</p>
-
-<p><%= link_to 'Change your password', edit_password_url(@resource, reset_password_token: @token) %></p>
-
-<p>If you didn't request this, please ignore this email.</p>
-<p>Your password won't change until you access the link above and create a new one.</p>

app/views/devise/mailer/reset_password_instructions.html.haml

+.center
+  #content
+    %h2 Hello, #{@resource.name}!
+    %p
+      Someone, hopefully you, has requested to reset the password for your
+      GitLab account on #{link_to(Gitlab.config.gitlab.url, Gitlab.config.gitlab.url)}.
+    %p
+      If you did not perform this request, you can safely ignore this email.
+    %p
+      Otherwise, click the link below to complete the process.
+    #cta
+      = link_to('Reset password', edit_password_url(@resource, reset_password_token: @token))

app/views/devise/mailer/reset_password_instructions.text.erb

+Hello, <%= @resource.name %>!
+
+Someone, hopefully you, has requested to reset the password for your GitLab
+account on <%= Gitlab.config.gitlab.url %>
+
+If you did not perform this request, you can safely ignore this email.
+
+Otherwise, click the link below to complete the process:
+
+<%= edit_password_url(@resource, reset_password_token: @token) %>