updated api docs for stable docs

docs/api/api.rst

@@ -100,8 +100,8 b' OUTPUT::'
 create_user
 -----------
 
-Creates new user in RhodeCode. This command can be executed only using api_key
-belonging to user with admin rights.
+Creates new user or updates current one if such user exists. This command can 
+be executed only using api_key belonging to user with admin rights.
 
 INPUT::