[DOCS] Clarify remote/info and resolve/cluster descriptions (#3655)

Relates to elastic/elasticsearch#118993

This PR updates the remote info and resolve cluster specifications to (1) copy some missing descriptions from the docs (https://www.elastic.co/guide/en/elasticsearch/reference/master/cluster-remote-info.html and https://www.elastic.co/guide/en/elasticsearch/reference/master/indices-resolve-cluster-api.html) and (2) incorporate the changes from elastic/elasticsearch#118993

Co-authored by @lcawl

(cherry picked from commit 5b17efd)

Author: quux00