Use the same description

Author: David Heinemeier Hansson

railties/lib/rails/generators/rails/app/templates/Gemfile.tt

@@ -43,7 +43,7 @@ gem "bootsnap", ">= 1.4.4", require: false
 <%- end -%>
 <% if RUBY_ENGINE == "ruby" -%>
 group :development, :test do
-  # See https://github.com/ruby/debug for usage.
+  # See https://github.com/ruby/debug for usage
   gem "debug", ">= 1.0.0", platforms: %i[ mri mingw x64_mingw ]
 end
 

railties/lib/rails/generators/rails/plugin/templates/Gemfile.tt

@@ -32,7 +32,7 @@ end
 
 <% end -%>
 <% if RUBY_ENGINE == "ruby" -%>
-# To use a debugger
+# See https://github.com/ruby/debug for usage
 # gem "debug", ">= 1.0.0", group: %i[ development test ]
 <% end -%>
 <% if RUBY_PLATFORM.match(/bccwin|cygwin|emx|mingw|mswin|wince|java/) -%>