Add syntax quick ref

docs/_docset.yml

@@ -1,4 +1,4 @@
 project: 'doc-builder'
 max_toc_depth: 2
 # indicates this documentation set is not linkable by assembler.
 # relaxes a few restrictions around toc building and file placement
@@ -13,6 +13,8 @@
   serverless-short: Serverless
   ece:   "Elastic Cloud Enterprise"
   eck:   "Elastic Cloud on Kubernetes"
+  ech:   "Elastic Cloud Hosted"
+  kib:   "Kibana"
 
 features:
   primary-nav: false
@@ -68,6 +70,7 @@
   - folder: syntax
     children:
       - file: index.md
+      - file: quick-ref.md
       - file: headings.md
       - file: admonitions.md
       - file: applies.md