Add description of ability to pass several URIs in configuration parameter and the new syntax for that

Part of #2492

Author: veod32

doc/reference/configuration/index.rst

@@ -75,12 +75,14 @@ Some configuration parameters and some functions depend on a URI, or
 So it may contain (in order) a user name
 for login, a password, a host name or host IP address, and a port number. Only
 the port number is always mandatory. The password is mandatory if the user
-name is specified, unless the user name is 'guest'. So, formally, the URI
+name is specified, unless the user name is 'guest'.
+
+Formally, the URI
 syntax is ``[host:]port`` or ``[username:password@]host:port``.
 If host is omitted, then '0.0.0.0' or '[::]' is assumed,
 meaning respectively any IPv4 address or any IPv6 address,
 on the local machine.
-If username:password is omitted, then 'guest' is assumed. Some examples:
+If ``username:password`` is omitted, then 'guest' is assumed. Some examples:
 
 ..  container:: table
 
@@ -97,10 +99,39 @@ If username:password is omitted, then 'guest' is assumed. Some examples:
     | username:password@host:port | notguest:[email protected]:3301 |
     +-----------------------------+------------------------------+
 
-In certain circumstances a Unix domain socket may be used
-where a URI is expected, for example "unix/:/tmp/unix_domain_socket.sock" or
+In certain circumstances, a Unix domain socket may be used
+where a URI is expected, for example, "unix/:/tmp/unix_domain_socket.sock" or
 simply "/tmp/unix_domain_socket.sock".
 
+Starting from version 2.10.0, a user can open several listening iproto sockets on a Tarantool instance
+and, consequently, can specify several URIs in the configuration parameters such as :ref:`box.cfg.listen <cfg_basic-listen>` and :ref:`box.cfg.replication <cfg_replication-replication>`.
+
+In addition to specifying URI as a number or a string, a number of other ways to pass URI values is available starting from Tarantool 2.10.0:
+
+*   As a string with one or several URIs separated by commas (provides backward compatibility)
+
+    code-block:: lua
+
+    box.cfg { listen = "127.0.0.1:3301, /unix.sock, 3302" }
+
+*   As an array that contains URIs in a string format
+
+    code-block:: lua
+
+    box.cfg { listen = {"127.0.0.1:3301", "/unix.sock", "3302"} }
+
+*   As an array of tables with the ``uri`` field
+
+    code-block:: lua
+
+    box.cfg { listen = {
+            {uri = "127.0.0.1:3301"},
+            {uri = "/unix.sock"},
+            {uri = 3302}
+        }
+    }
+
+
 A method for parsing URIs is illustrated in :ref:`Module uri <uri-parse>`.
 
 ..  _index-init_label: