Remove wrong information about not running box.cfg{}

Resolves #1012

Author: patiencedaur

doc/reference/reference_lua/box_cfg.rst

@@ -106,11 +106,6 @@ default settings to all the parameters:
 
 The first call to ``box.cfg{...}`` (with or without parameters) initiates
 Tarantool's database module :ref:`box <box-module>`.
-Before Tarantool 2.0, you needed to call ``box.cfg{...}`` prior to performing
-any database operations.
-Now you can start working with the database outright, without calling
-``box.cfg{...}``. In this case, Tarantool initiates the database module and
-applies default settings, as if you said ``box.cfg{}`` (without parameters).
 
 ``box.cfg{...}`` is also the command that reloads
 :ref:`persistent data files <index-box_persistence>` into RAM upon restart