[9.0] Cleanup search connectors, add some reference -> docs content signposts in various sections (#123733)#124210

elasticsearchmachine merged 1 commit intoelastic:9.0elastic/elasticsearch:9.0from

leemthompo:backport/9.0/pr-123733leemthompo/elasticsearch:backport/9.0/pr-123733Copy head branch name to clipboard