Adds cloud to attributes62.asciidoc (#717)

Author: lcawl

shared/attributes62.asciidoc

@@ -23,6 +23,7 @@
 :defguide:             https://www.elastic.co/guide/en/elasticsearch/guide/master
 :painless:             https://www.elastic.co/guide/en/elasticsearch/painless/{branch}
 :plugins:              https://www.elastic.co/guide/en/elasticsearch/plugins/{branch}
+:cloud:                https://www.elastic.co/guide/en/cloud/current
 :ece-ref:              https://www.elastic.co/guide/en/cloud-enterprise/current
 :glossary:             http://www.elastic.co/guide/en/elastic-stack-glossary/current
 :upgrade_guide:        https://www.elastic.co/products/upgrade_guide