Fix missing changelog and docs entries (#2837)

* Adding missing changelog entries

* Modified changelog

* Add index deduplication option HTTP docs

* added info about ARANGODB_DEFAULT_ROOT_PASSWORD

* Revert "added info about ARANGODB_DEFAULT_ROOT_PASSWORD"

This reverts commit 3f0241f90c4e3f59c58edda5a1f6019debae9735.

CHANGELOG

@@ -14,8 +14,20 @@ devel
 
 * documentation and js fixes for secondaries
 
+* RocksDB storage format was changed, users of the previous beta/alpha versions
+  must delete the database directory and re-import their data
+
 * enabled permissions on database and collection level
 
+* added and changed some user related REST APIs
+    * added `PUT /_api/user/{user}/database/{database}/{collection}` to change collection permission
+    * added `GET /_api/user/{user}/database/{database}/{collection}`
+    * added optional `full` parameter to the `GET /_api/user/{user}/database/` REST call
+
+* added user functions in the arangoshell `@arangodb/users` module
+    * added `grantCollection` and `revokeCollection` functions
+    * added `permission(user, database, collection)` to retrieve collection specific rights 
+
 * added "deduplicate" attribute for array indexes, which controls whether inserting
   duplicate index values from the same document into a unique array index will lead to
   an error or not:

Documentation/DocuBlocks/Rest/Indexes/JSF_post_api_index_hash.md

@@ -21,6 +21,9 @@ if *true*, then create a unique index.
 @RESTBODYPARAM{sparse,boolean,required,}
 if *true*, then create a sparse index.
 
+@RESTBODYPARAM{deduplicate,boolean,optional,boolean}
+if *false*, the deduplication of array values is turned off.
+
 @RESTDESCRIPTION
 **NOTE** Swagger examples won't work due to the anchor.
 

Documentation/DocuBlocks/Rest/Indexes/JSF_post_api_index_skiplist.md

@@ -21,6 +21,9 @@ if *true*, then create a unique index.
 @RESTBODYPARAM{sparse,boolean,required,}
 if *true*, then create a sparse index.
 
+@RESTBODYPARAM{deduplicate,boolean,optional,boolean}
+if *false*, the deduplication of array values is turned off.
+
 @RESTDESCRIPTION
 
 Creates a skip-list index for the collection *collection-name*, if