Add in APIv4 Actions documentation

docs/api/v3/actions.md

-# API Actions
+# APIv3 Actions
 
 Most entities support the following actions:
 

docs/api/v4/actions.md

+# APIv4 Actions
+
+Most entities support the following actions:
+
+## create
+
+Insert one records into the database.
+
+## Update
+
+Update a record in the database.
+
+## delete
+
+Delete one or more records. (Note: Requires an explicit `id`. Note: if you want to skip the 'recycle bin' for entities that support undelete (e.g. contacts) you should set `$param['skip_undelete'] => 1);`
+
+## get
+
+Search for records
+
+## getfields
+
+Fetch entity metadata, i.e. the list of fields supported by the entity
+
+## replace
+
+Replace an old set of records with a new or modified set of records. (For example, replace the set of "Phone" numbers with a different set of "Phone" numbers.).
+
+Warning - REPLACE includes an implicit delete - use with care & test well before using in productions
+
+## Save
+
+Create or update one or more records

mkdocs.yml

@@ -50,7 +50,7 @@ pages:
   - API Interfaces: api/interfaces.md
   - APIv4:
     - APIv4 Usage: api/v4/usage.md
-  #  - APIv4 Actions: api/v4/actions.md
+    - APIv4 Actions: api/v4/actions.md
   #  - APIv4 Options: api/v4/options.md
   #  - APIv4 Joins: api/v4/joins.md
   #  - APIv4 Chaining: api/v4/chaining.md