Minor: comment formatting

Author: estolfo

rake_tasks/test_tasks.rake

@@ -30,7 +30,7 @@ namespace :test do
     end
   end
 
-  # Note start Elasticsearch with the following command if Docker is not used.
+  # Note: Start Elasticsearch with the following command if Docker is not used.
   # bin/elasticsearch -Erepositories.url.allowed_urls=http://* -Epath.repo=/tmp -Enode.attr.testattr=test
   desc "Run rest api tests"
   task :rest_api => ['elasticsearch:update', 'elasticsearch:wait_for_green'] do