Consistent no-period comments

Author: dhh

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

@@ -47,6 +47,6 @@ RUN SECRET_KEY_BASE_DUMMY=1 bundle exec rails assets:precompile
 # Entrypoint prepares the database.
 ENTRYPOINT ["/rails/bin/docker-entrypoint"]
 
-# Start the server by default, this can be overwritten at runtime.
+# Start the server by default, this can be overwritten at runtime
 EXPOSE 3000
 CMD ["./bin/rails", "server"]